We know that, on average, more sociable individuals in the U.S. are more likely to invest in the stock market than others. Think about two groups of workers: one group works in the finance industry and the other group works in the engineering industry. Assume that, on average, workers in these two industries have similar years of education, intelligence and wages. For which group of workers do you think sociability would have a bigger effect on the likelihood of stock market participation? Why?