What key industry was an Indicator that the economy was sick and in danger of collapse, suggesting a depression was coming

The less production of iron and steel industry and collapse of banking system were an indicator that the economy was sick and in danger of collapse, suggesting a depression was coming

Explanation:

Great economic depression was happened in 1929. This depression worstly affected the U.S. market economy and the labors for a decade. The less production in different large scale industries collapse the whole economic system through recession in monetary system and depression in economic growth.

Less production led to the increase number of sick industries which endangered the economic growth, prosperity and the base of the whole nation. Fromthe end of the 1920s it was started and continued for a decade.