We study the impact of public subsidies on the efficiency of performing arts through an empirical analysis of Italian theatres (including opera houses, permanent theatres, and theatre production companies), using an output-oriented approach. Firstly, we discuss the previous works on efficiency and its determinants in the presence of public subsidies. Secondly, the stochastic frontier analysis true random-effects model and the IV GMM second stage regressions are used together with a procedure to measure the marginal effects of subsidies. Our findings suggest that the impact of public funds on technical efficiency of the Italian theatrical firms is positive and significant. The elasticity of public subsidy on efficiency is smaller than one. However, the return on subsidies amounts to 87 on average. These returns vary between Italian performing arts sub-sectors, and are very high for theatre production companies, low for permanent theatres, and very low for opera houses. We also find that the technological progress is negative for the theatrical Italian sector and it leads to the decline in total factor productivity over time, providing empirical support to the presence of Baumol's disease in the sector. Overall, since Italian theatres technical efficiency could be increased at least by 25¿27%, policy makers could work on public incentives in such a way as to avoid that, due to asymmetric information between government and theatrical firms, subsidies are provided (and criticised) indiscriminately.