price elasticity
Price elasticity measures how sensitive the quantity demanded (or supplied) of a good is to a change in its price. The formula is:
PED = % change in quantity demanded / % change in price
- Elastic (|PED| > 1): quantity changes more than price (e.g., luxury goods, items with many substitutes)
- Inelastic (|PED| < 1): quantity changes less than price (e.g., necessities, insulin)
- Unit elastic (|PED| = 1): quantity and price change by the same proportion
Key determinants include availability of substitutes, whether the good is a necessity or luxury, time horizon, and share of income spent on the good.
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Here is a thorough breakdown of price elasticity:
Price Elasticity of Demand (PED)
Definition & Formula
PED measures how much the quantity demanded of a good changes in response to a price change.
PED = % change in Quantity Demanded
─────────────────────────────
% change in Price
The result is almost always negative (price up → quantity down), but economists often report the absolute value.
The Elasticity Spectrum
| Value | Classification | Meaning |
|---|---|---|
| PED = 0 | Perfectly inelastic | Quantity never changes (e.g., life-saving medication) |
| 0 < |PED| < 1 | Inelastic | Quantity changes less than price |
| |PED| = 1 | Unit elastic | Quantity and price change equally |
| |PED| > 1 | Elastic | Quantity changes more than price |
| PED = ∞ | Perfectly elastic | Any price increase sends demand to zero |
Worked Example
Price rises from £10 to £12 (+20%). Quantity falls from 100 to 80 units (-20%).
PED = -20% / +20% = -1.0 (unit elastic)
Another example: Price falls from £8 to £6 (-25%). Quantity rises from 200 to 250 (+25%).
PED = +25% / -25% = -1.0 (unit elastic)
Determinants of PED
- Availability of substitutes - more substitutes = more elastic (e.g., cola brands)
- Necessity vs. luxury - necessities (bread, insulin) are inelastic; luxuries (designer bags) are elastic
- Time horizon - demand becomes more elastic over time as consumers adjust behavior
- Proportion of income - goods that take up a large share of income tend to be more elastic
- Breadth of market definition - "food" is inelastic, but "pizza" is elastic (can switch to pasta)
- Habit/addiction - cigarettes, coffee tend to be inelastic
Real-World Examples
| Good | Elastic/Inelastic | Why |
|---|---|---|
| Insulin | Highly inelastic | No substitute, life-critical |
| Salt | Highly inelastic | Cheap, necessity, no substitute |
| Airline tickets | Elastic | Many competitors, can delay travel |
| Luxury handbags | Elastic | Non-essential, discretionary spending |
| Petrol (short run) | Inelastic | Few immediate alternatives |
| Petrol (long run) | More elastic | People switch to EVs, move closer to work |
| Fast food | Moderately elastic | Substitutable, but convenient |
Revenue Implications
This is the key business application:
- Inelastic demand: Raising price increases total revenue (TR = P × Q; Q drops little)
- Elastic demand: Raising price decreases total revenue (Q drops a lot)
- Unit elastic: Price change has no effect on total revenue
Related Concepts
- Price Elasticity of Supply (PES): Same formula but for quantity supplied. Elastic supply = producers can respond quickly to price changes.
- Cross-Price Elasticity (XED): Measures how demand for Good A changes when Good B's price changes. Positive XED = substitutes; Negative XED = complements.
- Income Elasticity (YED): How demand changes with income. Positive = normal good; Negative = inferior good.
- Midpoint / Arc Elasticity: Uses the average of the two prices/quantities as the base to avoid directional bias in percentage calculations.
Arc (Midpoint) Formula
More accurate when comparing two points on a demand curve:
PED = (Q2 - Q1) / [(Q1 + Q2) / 2]
─────────────────────────────
(P2 - P1) / [(P1 + P2) / 2]
Let me know if you want to go deeper on any specific aspect - supply elasticity, income elasticity, business pricing strategy, or numerical practice problems.
price elasticity health economics
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"price elasticity" AND "health care demand"
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https://pmc.ncbi.nlm.nih.gov/articles/PMC5600717
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RAND Health Insurance Experiment price elasticity estimates by service type healthcare
Here is a thorough treatment of price elasticity in health economics, drawing from academic sources, empirical research, and the landmark RAND Health Insurance Experiment:
Price Elasticity in Health Economics
Why Healthcare Demand Is Special
In standard markets, price elasticity works cleanly - raise the price, fewer people buy. Healthcare is distorted by several forces that make this relationship more complex:
- Insurance - patients rarely pay the full price, so they respond to out-of-pocket cost, not sticker price
- Information asymmetry - patients don't know what care they need; physicians decide demand on their behalf (supplier-induced demand)
- Necessity - many services are not truly discretionary (emergency care, chronic disease management)
- Moral hazard - insurance reduces the effective price to near zero at point of use, blunting price signals
- Fear and urgency - a chest pain patient is not a rational price-comparing consumer
The Core Finding: Healthcare Demand Is Inelastic
Most empirical estimates of the overall price elasticity of demand (PED) for healthcare cluster around -0.10 to -0.40, meaning a 10% increase in price reduces demand by only 1-4%. This confirms healthcare demand is significantly inelastic at the market level.
The central estimate from the literature tends to converge on approximately -0.17 for overall healthcare. - JaypeeDigital, Health Economics textbook
The RAND Health Insurance Experiment (HIE)
The most important empirical study in this field. Conducted in the 1970s-80s, it randomly assigned families to health plans with varying levels of cost-sharing (coinsurance rates of 0%, 25%, 50%, 95%). Key findings:
- Overall PED for medical spending: approximately -0.2 (Manning et al., 1987)
- People with free care used about 45% more services than those with full cost-sharing
- Higher cost-sharing reduced both necessary and unnecessary care equally - patients could not distinguish
- Effect was stronger for outpatient care than inpatient emergency care
- The RAND HIE summary remains the gold standard reference, though scholars continue to debate whether a single elasticity number adequately summarizes responses to nonlinear insurance contracts
Elasticity Varies Widely by Service Type
A large-scale study using 171 million person-months of private insurance data found substantial heterogeneity (Brot-Goldberg et al., PMC5600717):
| Service | Price Elasticity |
|---|---|
| Prevention / wellness visits | -0.02 (nearly perfectly inelastic) |
| Emergency room visits | -0.04 (extremely inelastic) |
| Mammograms | -0.11 |
| Mental health / substance abuse | -0.26 |
| Specialty outpatient visits | -0.32 |
| Pharmaceuticals | -0.44 (most elastic) |
| Surgical procedures / dialysis | ~0 (statistically insignificant) |
Key interpretation:
- Emergency and life-critical care: people use it regardless of price - near-zero elasticity
- Prescription drugs: more discretionary, more substitutes available, more elastic
- Mental health services: intermediate - partly discretionary, stigma and access barriers also play a role
Market-Level vs. Firm-Level Elasticity: An Important Distinction
This is critical for healthcare managers:
- Market-level (all hospitals together): inelastic (~-0.17), because there are few substitutes for "hospital care" as a category
- Firm-level (one specific hospital): elastic (~-1.4 or more), because patients can substitute between competing hospitals
Rule of thumb formula:
Firm PED = Market PED / Firm's market share
Example: If market PED = -0.17 and a hospital has 12% market share:
Firm PED = -0.17 / 0.12 = -1.42 (elastic)
This means an individual hospital raising its prices will lose significantly more patients than the industry as a whole. Patients treat competing hospitals as close substitutes - AMIHM Healthcare Management.
Elasticity of Demand for Health Insurance
Separate from care utilization, the elasticity of demand for health insurance enrollment itself:
| Study | Setting | Elasticity |
|---|---|---|
| Cutler & Reber (1996) | Harvard employees | -0.3 to -0.6 |
| Marquis & Phelps (RAND HIE) | Experimental | -0.6 |
| Royalty & Solomon (1998) | Stanford employees | -1.0 to -1.8 |
| Barringer & Mitchell (1994) | Single US company | -0.1 to -0.2 |
Insurance demand is more elastic than care utilization - people actively avoid coverage when premiums rise, especially younger, healthier individuals. This is the source of adverse selection problems.
Income Elasticity of Healthcare
- Healthcare is a normal good - consumption rises with income
- However, it rises more slowly than income, meaning it is an income-inelastic normal good at the individual level
- At the national level (GDP comparisons), health spending appears to have income elasticity > 1 (a luxury good), though this is debated
- Poor populations have higher elasticity responses to cost-sharing - price barriers hit lower-income groups harder, creating equity concerns
Policy Implications
| Policy Tool | Mechanism | Effect |
|---|---|---|
| Copayments / deductibles | Increase out-of-pocket price | Reduce utilization, but risk deterring necessary care |
| Drug pricing / formularies | Affect pharmaceutical elasticity | Can shift patients to generics (high cross-price elasticity) |
| Sin taxes (tobacco, alcohol, sugar) | Exploit higher elasticity of these goods | Reduce consumption and generate revenue |
| Free preventive care (ACA) | Set price = 0 | Increases uptake of inelastic prevention services |
| High-deductible health plans (HDHPs) | Raise effective price | Show higher demand elasticities than HMOs |
Tobacco and Alcohol: High Elasticity Cases in Health
Unlike general healthcare, demand for tobacco and alcohol is more elastic:
- Cigarettes: PED approximately -0.4 to -0.6 in high-income countries; up to -0.8 in low-income countries
- This elasticity underpins the WHO tobacco taxation strategy - price increases are an effective public health tool
- Cross-price elasticity research shows tobacco product substitution when one product's price rises (e.g., cigarette price up → e-cigarette demand rises)
Summary Table
| Concept | Healthcare Value | Interpretation |
|---|---|---|
| Overall PED | ~-0.17 | Highly inelastic market |
| Emergency care PED | ~-0.04 | Virtually no price response |
| Pharmaceutical PED | ~-0.44 | Most elastic healthcare category |
| Insurance enrollment PED | -0.3 to -1.8 | Moderately to highly elastic |
| Income elasticity (individual) | < 1 | Normal, income-inelastic good |
| Tobacco PED | -0.4 to -0.8 | Elastic enough for tax policy |
The fundamental take-away for health economics is that inelastic demand protects utilization of essential care but also enables providers to raise prices without losing many patients - a major driver of healthcare cost inflation, especially in markets without price regulation.
MRD MEDICAL RECORD DEPARTMNT
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MRD medical record department hospital functions organization
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medical records department MRD numbering filing coding retention confidentiality hospital administration
Here is a comprehensive overview of the Medical Record Department (MRD) in a hospital:
Medical Record Department (MRD)
Definition of a Medical Record
A medical record is a scientific, clinical, administrative, and legal document relating to patient care, in which is recorded sufficient data, written in sequence of events, to justify the diagnosis, treatment, and results. - Govt. Medical College Kathua SOP
It is a narrative that documents all events during treatment - progress notes, investigations, medications, nursing observations, and discharge summaries. - Kaplan & Sadock's Synopsis of Psychiatry
Importance of MRD
The MRD is referred to as the "eyes and ears of hospital administration". It serves:
For the Patient:
- Documents the clinical story of illness
- Assists in follow-up care
- Serves as evidence in legal cases
- Enables issuance of certificates (disability, sterilization, fitness, etc.)
For the Doctor:
- Ensures quality and adequacy of diagnostic/therapeutic measures
- Provides continuity of care
- Supports research, teaching, and publication
For the Hospital:
- Documents type and quantity of work performed
- Evaluates proficiency of individual doctors (clinical and administrative)
- Evaluates hospital services
- Facilitates budget preparation
- Generates statistical data
- Assists in future program planning
- Enables medical audit
For Regulatory/Insurance Bodies:
- Determines length of stay, quality of care, and reimbursement to doctors and hospitals
Contents of a Medical Record
A complete medical record includes:
| Category | Contents |
|---|---|
| Identification | Patient name, age, sex, address, MRD number |
| Legal documents | Admission and consent forms |
| Clinical data | History, examination findings, diagnosis |
| Investigation reports | Lab tests, X-rays, ECG, pathology, imaging |
| Treatment plan | Written care plan, medication orders (signed, dated) |
| Progress notes | Signed by all treating staff |
| Nursing notes | Patient responses, behavior, adverse effects |
| Consultation summaries | Case conferences, specialist opinions |
| Discharge summary | Course of illness, treatment, recommendations |
| Referral documentation | Records of referral to other agencies |
Organization and Location of MRD
The MRD system should be centralized in a hospital. A centralized MRD connects with:
Centralized HMS
├── Administration
├── Data Processing
├── Drug Stores
├── Laboratories
├── MR Department ← Hub
├── Wards
├── Ancillary Departments
└── Accounting Office
Numbering Systems
The aim of numbering is systematic storage and easy retrieval. Common systems:
| System | Description |
|---|---|
| Serial (sequential) numbering | Each new patient/visit gets the next number |
| Unit numbering | One permanent number per patient, used for all visits |
| Serial-unit numbering | Each admission gets a new number, but old records are moved to the latest number |
| Family numbering | One number per family unit |
The unit numbering system is preferred in most modern hospitals - it keeps all of a patient's records together under one lifelong number.
Filing Systems
| System | Description | Used For |
|---|---|---|
| Straight numerical | Records filed in exact numerical order | Simple, large hospitals |
| Terminal digit | Records filed by last 2 digits first | Large volume, easier retrieval, even distribution of workload |
| Middle digit | Filed by middle digits | Some specialized systems |
| Alphabetical | Filed by patient surname | Small clinics |
Terminal digit filing is the most widely used system in large hospitals.
Coding Systems
Medical records are coded for statistical analysis and billing:
- ICD (International Classification of Diseases) - the global standard, currently ICD-11
- CPT (Current Procedural Terminology) - codes for procedures (mainly used in the USA)
- DRG (Diagnosis-Related Groups) - groups diagnoses for hospital billing and reimbursement
Medical coders abstract information from the record and assign appropriate codes for:
- Diseases and diagnoses
- Surgical and medical procedures
- Cause of death
- Hospital statistics reporting
Staffing Pattern
| Role | Responsibility |
|---|---|
| MRD Officer / In-charge | Overall management, policy implementation, compliance |
| Medical Record Technicians | Filing, retrieval, coding, data entry |
| Health Information Manager | Data analysis, statistics, research support |
| Clerks / Assistants | Registration, record handling |
The officer-in-charge should be a specifically trained professional - ideally with a degree/diploma in Health Information Management (HIM).
Retention of Medical Records
Retention periods vary by country and type of record:
| Record Type | Retention Period (general guideline) |
|---|---|
| Adult inpatient records | 7-10 years from last contact |
| Minor patient records | Until age of majority + 7 years |
| Obstetric records | 25 years (due to childbirth-related claims) |
| Mental health records | 20 years or until death |
| X-rays / images | 5-8 years |
| Death records | Permanent |
After the retention period, records are destroyed in a confidential manner (shredding, incineration).
Confidentiality and Security
- Medical records are the property of the hospital, not the patient
- Contents are confidential - accessible only to authorized personnel
- Can be released to: the patient themselves, legal guardian, court order, or insurer with consent
- HIPAA (USA) and equivalent national laws govern privacy and security
- Electronic records must have access logs, encryption, and audit trails
Hospital Statistics Generated by MRD
Key statistics compiled by MRD:
| Statistic | Definition |
|---|---|
| Bed occupancy rate (BOR) | % of beds occupied at a given time |
| Average length of stay (ALOS) | Total patient days / total discharges |
| Bed turnover rate | No. of patients per bed per year |
| Gross death rate | All deaths per 100 admissions |
| Net death rate | Deaths after 48 hrs per 100 admissions |
| Surgical mortality rate | Deaths within 10 days of surgery |
| Hospital infection rate | Infections acquired in hospital |
Functions of MRD - Summary
- Registration - assigning MRD number, patient identification
- Record compilation - assembling all documents in correct order
- Coding and indexing - ICD coding, disease index, operation index
- Filing and retrieval - systematic storage and fast retrieval
- Statistical reporting - hospital statistics, annual reports
- Medico-legal work - handling legal requests, court orders
- Medical audit support - providing records for quality review
- Research support - data for clinical research and education
- Correspondence - insurance claims, transfer summaries
- Custodianship - safeguarding records and ensuring confidentiality
Electronic Medical Records (EMR) / EHR
Modern MRDs are transitioning from paper to Electronic Health Records (EHR):
- Faster retrieval and sharing across departments and facilities
- Built-in decision support and alerts
- Automatic coding assistance
- Biosurveillance and research analytics
- Reduces duplication and transcription errors
- Requires robust data security, backup systems, and staff training
The MRD is a foundational department in any hospital - it underpins clinical care, legal compliance, financial operations, quality improvement, and public health reporting.
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