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A city wants to study the effect of a new small business grant on local employment. The grant is awarded to all businesses located on streets with a 'walkability score' of 75 or higher. To measure the grant's impact, researchers compare the change in employment for businesses on streets with scores between 75-77 (who received the grant) to businesses on streets with scores between 73-74 (who did not). For this study's conclusion about the grant's effect to be valid, which of the following must be the most critical assumption?
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