Answer:
The method of A. Limits requires this.
Explanation:
The method of limits is generally used in research and it is used to <em>establish an individual's perception of a certain stimulus</em> through understanding the level at which it is perceived by him/her.
The stimulus is <em>presented and varies</em>, by being <em>decreased or increased</em>, until it is perceivable by the individual. The experimenter needs to vary the perceptible stimulus until it is no longer perceived and the imperceptible stimulus until it is perceived in order to measure the level at which perception is possible.
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Trade blocs. One of the key words in the initial description is the idea of regional. Coordinating efforts to reduce trade barriers, including decreasing or eliminating tariffs are part of decision to make certain blocs or groups of trading syndicates more viable and strategic in international trade.
