Kirby (NYSE:KEX) has outperformed the market over the past 20 years by 1.59% on an annualized basis producing an average annual return of 9.81%. Currently, Kirby has a market capitalization of $6.80 billion. Buying $1000 In KEX: If an investor had bought $1000 of KEX stock 20 years ago, it would be worth $6,646.64 today based on a price of $116.67 for KEX at the time of writing. Kirby’s Performance Over Last 20 YearsFinally — what’s the point of all this? The key insight to take from this article is to note how much of a difference compounded returns can make in your cash growth over a period…