Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why don't share prices of a company rise every other Friday when the company buys shares for its own employees?
Let's take an example: IBM has about 430,000 employees worldwide.  Assume the average yearly salary is $80K (it's probably less, since a lot of jobs are offshore).  If every employee took 10% of their pay as stock, that's $132 million every two weeks.  But IBM's market capitalization is about $153 billion, so stock purchases would be less than 0.1% of that.