From 1927 to 1929, the average price of stocks in the Dow Jones index increaseddecreasedstayed the same.

The average price of stocks in the Dow Jones index increased from 1927 to 1929. The index rose substantially during this period, reaching record highs in 1929 before the stock market crash later that year, so “increased” is the correct choice.

AI-written and checked against the verified answer.