Identify the trade-restraining practice that this example demonstrates. Two retailers decide that they will both sell no more than 100 premium TV's per month in order to maintain the quality image of the TV's

The right approach is "Controlling output".

Explanation:

Correlation between these two retailers starts deciding that they would rather whether to sell no upwards of hundred TV premium increases for every month throughout order to ensure the highest TV appearance.This seems to be essentially successful when something is necessary to maintain this same inventory but instead influence the suitable provision including its corporation as well as to create pricing power by offering to buy a small share of the economy.