list down three of the variables essential to measure the performance of regional integration schemes?

1. Economic growth and development: This variable measures the impact of regional integration on the economic growth and development of member countries. It includes indicators such as GDP growth, trade volume, investment flows, and employment rates.

2. Trade and investment flows: This variable measures the extent to which regional integration has facilitated trade and investment among member countries. It includes indicators such as trade balance, foreign direct investment inflows, and intra-regional trade volume.

3. Institutional effectiveness: This variable measures the effectiveness of the institutions and mechanisms established by regional integration schemes to promote cooperation and integration among member countries. It includes indicators such as the implementation of regional agreements, the enforcement of rules and regulations, and the resolution of disputes.

1. Trade creation and diversion
2. Economic growth
3. Political stability