This fund manager says Amazon and other large-cap tech companies will make lots of money for investors for years to come

Scott Berg’s T. Rowe Price Global Growth Stock Fund last year more than doubled the return of the S&P 500 Index and did even better against its benchmark by betting on large-cap technology companies and next-generation disruptors.

In an interview, Berg, who joined T. Rowe Price as an analyst in 2002, explained his investment philosophy and why some stocks that have been called “too expensive” by investors over the years have actually been reasonably priced. Massive gains are sustainable, he said, because of double-digit increases…