MIAMI BEACH — Endowments are rethinking where they invest as they brace for weaker returns from traditional assets.

At the iConnections conference on Tuesday, several chief investment officers said the playbook that drove gains over the past decade may not work as well in the next one. Equity valuations remain high, credit spreads are near historic lows, and private markets are crowded, leaving little room for error.

“I think in general, our expectations are that for all of the traditional asset classes that we’ve invested in, we sort of believe this is both return compression and probably Alpha compression,” said Kim Lew, CEO and president of Columbia Investment Management Company.

Lower expected returns create a math problem….