Having a single market ensures a competitive environment for both consumers and markets which make monopolies existence hard. Among the consequences of these unique markets is that ineffective companies market share will decrease and it may have to close down. Some sectors of the national economy may undergo of negative impact due to an increase on international competitiveness, which the main reason is the transition to single markets, specially companies that used to benefit of national market protection may have a hard time to deal against their more efficient peers.