market niche
US /ˈmɑːrkɪt niːʃ/
UK /ˈmɑːrkɪt niːʃ/

1.
nicho de mercado
a small but profitable segment of a market suitable for focused attention by a marketer
:
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The company found its market niche by specializing in organic pet food.
A empresa encontrou seu nicho de mercado ao se especializar em alimentos orgânicos para animais de estimação.
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Identifying a profitable market niche is crucial for startups.
Identificar um nicho de mercado lucrativo é crucial para startups.