傳統上商家會用不同顏色的墨水來記帳：紅色表示虧損；反之黑色則為有盈利。

傳統上商家會用不同顏色的墨水來記帳：紅色表示虧損；反之黑色則為有盈利。商家把這個星期五叫做黑色星期五，用以期待這一天過後，年度營收由負轉正，由紅字轉為黑字。

結果 (英文) 1:

Traditionally businesses will use different colors of ink to accounting: red indicates a loss; on the contrary, compared with a profit of black. Business this Friday is called Black Friday, the day after to expect annual revenues from negative to positive, from the red into black.

結果 (英文) 2:

Traditionally, merchants use different colors of ink to book: red for losses, and black for profit. Merchants call this Friday Black Friday to look forward to the day after which annual revenue turns from negative to positive, from red to black.

結果 (英文) 3:

Traditionally, businesses use different colors of ink to keep accounts: red means loss; black means profit. Businesses call this Friday Black Friday to look forward to the change of annual revenue from negative to positive and from red to black after this day.