Economists make assumptions to represent their political bias. focus their thinking. make models easier for students to understand. better match the complexity of the real world.

The correct answer is letter "D": better match the complexity of the real world.

Explanation:

Economists create models to reflect real-world phenomena through simplified concepts. Those models tend to adopt the most variables possible of economic events to analyze them in-deep, find out why they happen, attempt preventing them or finding a solution for them if feasible.