My try: Bizncs A) The emergence of a new fast food chain has caused huge losses for XYZ Chicken in the same building last month. B) The emergence of a new fast food chain caused huge losses for XYZ Chicken in the same building last month. If you say "last month" in the end of the sentence, it will be proper to use the simple past tense.
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Bizncs A) The emergence of a new fast food chain has caused huge losses for XYZ Chicken in the same building last month.
B) The emergence of a new fast food chain caused huge losses for XYZ Chicken in the same building last month. If you say "last month" in the end of the sentence, it will be proper to use the simple past tense.
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