# 8.1 Tracking inflation

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By the end of this section, you will be able to:

• Calculate the annual rate of inflation
• Explain and use index numbers and base years when simplifying the total quantity spent over a year for products
• Calculate inflation rates using index numbers

Dinner table conversations where you might have heard about inflation usually entail reminiscing about when “everything seemed to cost so much less. You used to be able to buy three gallons of gasoline for a dollar and then go see an afternoon movie for another dollar.” [link] compares some prices of common goods in 1970 and 2014. Of course, the average prices shown in this table may not reflect the prices where you live. The cost of living in New York City is much higher than in Houston, Texas, for example. In addition, certain products have evolved over recent decades. A new car in 2014, loaded with antipollution equipment, safety gear, computerized engine controls, and many other technological advances, is a more advanced machine (and more fuel efficient) than your typical 1970s car. However, put details like these to one side for the moment, and look at the overall pattern. The primary reason behind the price rises in [link] —and all the price increases for the other products in the economy—is not specific to the market for housing or cars or gasoline or movie tickets. Instead, it is part of a general rise in the level of all prices. In 2014, \$1 had about the same purchasing power in overall terms of goods and services as 18 cents did in 1972, because of the amount of inflation that has occurred over that time period.

Price comparisons, 1970 and 2014
Items 1970 2014
Pound of ground beef \$0.66 \$4.16
Pound of butter \$0.87 \$2.93
Movie ticket \$1.55 \$8.17
Sales price of new home (median) \$22,000 \$280,000
New car \$3,000 \$32,531
Gallon of gasoline \$0.36 \$3.36
Average hourly wage for a manufacturing worker \$3.23 \$19.55
Per capita GDP \$5,069 \$53,041.98

Moreover, the power of inflation does not affect just goods and services, but wages and income levels, too. The second-to-last row of [link] shows that the average hourly wage for a manufacturing worker increased nearly six-fold from 1970 to 2014. Sure, the average worker in 2014 is better educated and more productive than the average worker in 1970—but not six times more productive. Sure, per capita GDP increased substantially from 1970 to 2014, but is the average person in the U.S. economy really more than eight times better off in just 44 years? Not likely.

A modern economy has millions of goods and services whose prices are continually quivering in the breezes of supply and demand. How can all of these shifts in price be boiled down to a single inflation rate? As with many problems in economic measurement, the conceptual answer is reasonably straightforward: Prices of a variety of goods and services are combined into a single price level; the inflation rate is simply the percentage change in the price level. Applying the concept, however, involves some practical difficulties.

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