Final answer:
Stock market speculation became more widespread in the 1920s due to prosperity, easy credit, and poor income distribution.
Step-by-step explanation:
The stock market speculation became significantly more widespread during the 1920s due to several factors. Firstly, the era's prosperity led to dramatic increases in stock prices, enticing many investors to become gamblers.
The 1920s, particularly the early part of the decade, was a period of economic prosperity in the United States. The country had experienced significant industrial growth and technological advancements, contributing to a general sense of optimism.
Additionally, the availability of easy credit and a culture that encouraged speculation and risk-taking contributed to irrational investing. Lastly, poor income distribution and a lack of savings among Americans meant there were no new buyers, leading to the collapse of the market.