If the orchestra performs less often because the violists have better paying jobs in a factory making the latest and greatest TVs, more homes will have the latest and greatest TVs.

Of course, this relies on the assumption most work - and hence most productivity - is a net social good. If the violinists have instead got jobs operating an orphan-crushing machine, that would be a bad thing. But hopefully your society is structured in such a way that the average worker is contributing to the prosperity of their local community.