How did the stock market crash of 1929 start

The stock market crash of 1929 was the result of heavy borrowing by consumer investors. The roaring 20's defined a period of time in which the market and the economy grew at a rapid rate. When the stock market corrected down, most of the investors who had margin loans were caught by surprise. This "margin squeeze" became the beginning of the end.

hello there!

the graphics that you have attached within the question, indicates that few people in bolivia work in industry according to its labor force.

however, the graphic that is on the right side of the picture shows the gdp sector in bolivia. this gross domestic product is a macroeconomic magnitude   that shows the monetary value of all finished goods and services within a country's borders in a specific time period. in this case, the graphic is showing the monetary value in each sector -agriculture, industry and services- of bolivia in 2012.

so, although the first graphic located at the left side indicates that not so many people work in industry, this is the second most important sector according to the gdp metrics because of the monetary value that impacts on its country. it does not need to be the most valuable one. if it makes an impact on the country's economy, it will be definitely crucial to it.