What caused speculation in 1920?

Speculation in the 1920s was primarily driven by a post-World War I economic boom, characterized by rising consumer confidence and increased investment in the Stock Market. The era saw the widespread use of credit and a belief that stock prices would continue to rise, encouraging many, including average citizens, to invest heavily. Additionally, technological advancements and innovations in industries such as automobiles and radio contributed to a sense of prosperity, further fueling speculative investments. This unsustainable growth ultimately led to the stock market crash of 1929.