Thứ Ba, 16 tháng 8, 2016

NPR News: Why High-Income Households Benefit More From Product Innovations

Why High-Income Households Benefit More From Product Innovations
A Stanford University researcher finds that products purchased mainly by poor people were increasing in price much more quickly than those purchased by the wealthy.

Đọc thêm tại NPR
at August 16, 2016 at 04:05PM
Health & Science

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