It's got to be the best intellectual exercise out there. You're seeing through new situations every ten minutes. In the stock market you don't base your decisions on what the market is doing, but on what you think is rational. Bridge is about weighing gain/loss ratios. You're doing calculations all the time.
Warren BuffettWith each investment you make, you should have the courage and the conviction to place at least ten per cent of your net worth in that stock
Warren Buffett