Federal Reserve Board Chair Janet Yellen

Stocks are higher on the first trading day in May and Krishna Memani, chief investment officer at Oppenheim Funds, tells CNBC's "Power Lunch" on Monday he's optimistic about global equities in both the short and long-terms.

"Modest growth in what may potentially be the longest business and credit cycles ever, low interest rates, low inflation, and ongoing global central bank monetary policy support are going to be the primary drivers of global equities' positive long-term performance," Memani said.