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Learn how much the Dow Jones Industrial Average has changed and why it is a poor indicator to gauge stock performance. I decided to research changes in the DJIA. How many companies from the last 20 years are the same and how many have changed? I researched the companies in the DJIA from 1997 - 2017. In the last 18 years, the Dow doubled from 10,000 to 20,000. That's an average of a 4% return. How many companies in the Dow are the same today? Are we comparing apples to apples? For example, if I go to the grocery store and pick out 30 different cans of food - olives, soup, green beans, peaches, etc. and add up the prices for each can, then twenty years later I change 10 cans and compare the prices to the original group of 30 cans from 20 years ago to today's group of 30 cans, what is that telling me? All we know is 66% of the cans are the same. That’s what the Dow Jones Industrial Average is like. Only 66% are the same companies from 20 years ago. The DJIA lost these 10 companies: Sears AT & T Eastman Kodak