WR Berkley (NYSE:WRB) has outperformed the market over the past 15 years by 3.18% on an annualized basis producing an average annual return of 15.21%. Currently, WR Berkley has a market capitalization of $23.47 billion. Buying $1000 In WRB: If an investor had bought $1000 of WRB stock 15 years ago, it would be worth $8,396.64 today based on a price of $61.65 for WRB at the time of writing. WR Berkley’s Performance Over Last 15 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 grow…