Inflation

Modeling Inflation: Pricing Inflation-Linked Products

Inflation eats your money. Slowly, usually, but sometimes fast. If you hold a regular bond, inflation erodes the value of every coupon and the principal repayment. Index-linked bonds solve this by tying payments to an inflation index like the Consumer Price Index (CPI) in the US or the Retail Price Index (RPI) in the UK. Chapter 71 of Wilmott’s book looks at how to model inflation and price these products. The answer turns out to be messier than you might hope.

Free to Choose Chapter 9: The Cure for Inflation

Take a five-dollar bill out of your wallet. Now cut a rectangle of the same size from a glossy magazine. Both are pieces of paper. Both have pictures and numbers on them. One can buy you lunch. The other is garbage. Why? That question – why green paper has value – is where the Friedmans begin their chapter on inflation. And the answer is stranger than you might think.

The Number: Why the Consumer Price Index Is Way More Important Than You Think

This is part 6 of my series on Who Is Government?: The Untold Story of Public Service by Michael Lewis.

Most chapters in this book have a person at the center. A scientist, an engineer, a government worker doing something remarkable. This chapter is different. John Lanchester’s essay is about a number. Just one number. And by the end, you’ll understand why that one number matters more than almost anything else the government produces.