Per game company, perhaps.
EVE Online is nothing but an economy; the whole game revolves around creating, trading, buying, and selling. You’d better believe CCP, the developing company, has people on staff whose sole job it is to analyze the market and make predictions about how the market will be affected by new mechanics, new blueprints, new enemies, and other additions to the game. Even back-end infrastructure adjustments can matter: there are a few central areas of trade in the game where thousands of players congregate, and as they upgrade their server hardware, the game becomes more responsive in that area, meaning more people can congregate and more trading can be done.
It’s a huge, complex system, and that’s just a single MMO. Any game developer that wants to take a serious stab at creating a sustainable economic system will (or should) have at least one economist on board, if not a small team.