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How does a change in market cap affect a company's operational decisions?
It basically only affects the company's dealings with its own stock, not with operational concerns.  If the company were to offer more stock for sale, it would get less cash.  If it had a stock buy-back program, it could buy more shares for the same money.  If it was to offer to acquire another company in exchange for its own stock, the terms would be less attractive to the other company's owners.  Employee stock remuneration, stock options, and so forth would be affected, so there might be considerations and tax consequences for the company.