Because legalization makes it easier to enter the sex market (both the workers and the institutions, i.e., brothels) by reducing the associated costs - sex workers are less to face legal harassment or arrests and the institution owners can invest in their business without fear of being shut down - we would then expect the size of the market to increase. Theoretically, this would correspond to an increase in the supply (a rightward shift in the supply curve), which would decrease the price of sex work. Furthermore, we would predict a change in the composition of the market as stigma decreases and more women enter the indoor market and (if indoor and outdoor transactions are close substitutes), then the overall size increase should increase and this should be accompanied by a change in the composition of the market.