Chapter 2 of 12
How Insurance Works — Risk Pooling
The simple concept of risk pooling that protects everyone.
Priya, a 28-year-old teacher in Chennai, once asked her insurance agent: "Why should I
pay ₹12,000 a year when I'm perfectly healthy?" The agent smiled and said, "That's exactly
why insurance works — because most people paying are healthy." Priya didn't fully understand
at the time, but she had stumbled upon the most fundamental concept in all of insurance: risk pooling. Understanding how insurance works mathematically will help you make smarter decisions and choose better insurers.
What Is Risk Pooling?
No individual can predict whether they will face a catastrophic event — but across a large
enough group, statistics become remarkably predictable. Insurance companies use this
mathematical certainty to price premiums and ensure they can pay all claims.
Imagine 1,000 people aged 35, all non-smokers, each paying ₹10,000 per year for a
₹1 crore life insurance policy.
- Total premium pool collected: 1,000 × ₹10,000 = ₹1,00,00,000 (₹1 crore)
- Based on mortality tables, approximately 3 people in this group will pass away in a year
- Claims paid out: 3 × ₹1 crore = ₹3 crore
- Wait — that's more than collected? This is why insurers cover many thousandsof such groups, mathematically balancing claims with premiums across a portfolio
- At scale (say 10 lakh policyholders), the numbers balance predictably — some yearsfewer claims, some years more — but the average holds
- The insurer keeps a portion for operating costs, agent commissions, and profit
The key insight: Each individual policyholder pays a small, manageable amount. In the rare event they face a loss, they receive a large payout funded by
everyone else's premiums. This is why insurance is not a "bad deal" even if you never
claim — you were buying peace of mind and financial protection.
How Premiums Are Calculated
Actuaries — mathematicians specialising in risk — calculate premiums based on several
factors:
- Age: Younger people have lower mortality risk → lower premiums. A30-year-old pays nearly half what a 45-year-old pays for the same cover.
- Health history: Pre-existing conditions, smoking, obesity increaserisk → higher premiums
- Occupation: High-risk jobs (mining, construction) attract loading
- Policy term: Longer terms have higher cumulative risk
- Sum assured: Higher cover = proportionally higher premium
The mortality rate for a 25-year-old in India is roughly 1.2 per 1,000 per year. For a 45-year-old, it's approximately 3.5 per 1,000. This is why waiting to buy term insurance is expensive — the premium you lock in at 25 is far lower than what you'd pay at 35 or 45. Buy term insurance young, lock in the low premium for life.
IRDAI and Solvency Ratios
The Insurance Regulatory and Development Authority of India (IRDAI) is the apex regulator
for all insurance companies operating in India. It sets rules to ensure that insurers can
always pay their claims — no matter how many people claim at once.
IRDAI regulations require every insurance company in India to maintain a minimum solvency ratio of 150% (1.5×). This means insurers must always hold assets 50% more than their total liabilities. Most reputable insurers like HDFC Life, ICICI Prudential, and LIC maintain solvency ratios well above 200%.
Claim Settlement Ratio — Your Most Important Metric
| Insurer | Claim Settlement Ratio (FY 2023–24) | Solvency Ratio | Known For |
|---|---|---|---|
| LIC | 98.6% | 185% | Largest insurer, government-backed |
| HDFC Life | 99.5% | 191% | Fastest claim processing, digital-first |
| Max Life | 99.35% | 208% | Highest CSR among private insurers |
| ICICI Prudential | 98.6% | 220% | Wide network, robust digital claims |
| SBI Life | 97.2% | 212% | Government-backed private insurer |
- CSR figures are approximate and change annually. Always verify the latest figures from
the IRDAI Annual Report or insurer websites before purchasing.
When comparing insurers, prioritise claim settlement ratio above almost everything else. The cheapest premium is useless if the insurer finds a reason to reject your family's claim. Stick to insurers with CSR consistently above 98% for the past 3–5 years.
The Law of Large Numbers
Insurance is essentially an application of the statistical law of large numbers: as sample
size increases, observed outcomes converge toward the statistically expected outcome. A flip
of 10 coins may give 8 heads, but 10,000 flips will give almost exactly 5,000 heads. For
insurers with millions of policyholders, actual claims closely track actuarial predictions — making the business model stable and mathematically sound.
An insurer's Claim Settlement Ratio (CSR) of 97% means:
Key Takeaways
- Insurance works through risk pooling — many people pay small premiums so the few who suffer losses receive large payouts
- Young, healthy people pay lower premiums because their statistical risk of claiming is much lower — buy term insurance early to lock in low rates
- IRDAI requires a minimum solvency ratio of 150%; reputable insurers like HDFC Life and Max Life maintain ratios well above 200%
- Always check the Claim Settlement Ratio (CSR) before choosing an insurer — prefer insurers with CSR consistently above 98%