And if you're an investor looking to find a manager who can actually deliver market-beating returns, you'll find that's a tough job too. Plenty of investment websites have fund-manager league tables.

Each month, we put a senior fund or investment manager to task with tough questions ... had a safe and predictable gainful job, I would put it almost entirely in the stock market, in companies ...

If you had any lingering doubts about whether the gender of fund managers affects investment performance ... the growth in portfolio manager jobs has disproportionally benefited men.