A “play” here means an investment tactic. It can mean investing in a particular company, or a particular industry, or even using a specific tactic - maybe buy in December and sell in February each year. In your example it means to invest in “new economy” companies, though I’m not sure how that would be defined exactly
Here is a website that uses it in the sentence:
In an arbitrage play, you buy something from one exchange or venue and sell it to another for a profit based on differences in the market price.