‘Keep it simple’ helps this stock-fund manager trounce the market

“ If you are optimistic, you are more likely to stay invested.”Here’s a valuable tip on how to beat the market: Keep it simple. This seems like dumb guidance in an investing world filled with erudite portfolio managers who try to dazzle investors with complex strategies as part of their marketing. But here’s proof that simple is better. The Hennessy Cornerstone Mid Cap 30 Fund HFMDX — which has a strategy so simple that even I can follow it — has topped i