Final answer:
The Heritage Foundation survey ranks countries by economic freedom based on variables like taxation and banking policy, but not on percent foreign ownership. Over 175 countries are scored, excluding those with extreme instability.
Step-by-step explanation:
The key economic variables considered in the Heritage Foundation survey for ranking countries by degree of economic freedom include taxation policy, government consumption of economic output, banking policy, and wage and price controls. However, the variable percent foreign ownership is not explicitly listed as a key factor in the Index of Economic Freedom report.
The survey assesses various aspects of economic freedom, which are then used to score and rank over 175 countries around the world. Some countries may not be ranked due to extreme instability, which makes it difficult to assess their economic freedom accurately. The subject of this question is Social Studies. The question asks about the key economic variables considered in the Washington, D.
C.-based Heritage Foundation survey, which ranks countries by degree of economic freedom. The options given include taxation policy, government consumption of economic output, percent foreign ownership, banking policy, and wage and price control. However, the one option that is not considered as a key economic variable in this survey is percent foreign ownership.