What problem did Wicker and colleagues (1993) find earlier with studies of Maslow's hierarchy?

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Wicker and colleagues (1993) found that earlier studies of Maslow's hierarchy tended to use a measure of "importance" of need satisfaction, which may not accurately reflect how needs are actually prioritized in individuals. This measure could result in a narrow and oversimplified understanding of the hierarchy.

What Problem Did Wicker and Colleagues (1993) Find Earlier with Studies