What are the negative effects of common market?

Common markets can lead to negative effects such as increased competition that may harm local businesses unable to compete with larger, more efficient firms from other countries. This can result in job losses and economic instability in certain sectors. Additionally, the potential for a "race to the bottom" in regulatory standards may occur, as countries might lower environmental or labor protections to attract investment. Lastly, a common market can exacerbate income inequality within and between member states, as wealth concentrates in more competitive regions.