The tendency of poorly performing stocks and well-performing stocks in one period to continue their performance into the next period is called the . fad effectb. martingale effectc. momentum effectd. reversal effect

C. momentum effect

Explanation:

it is the tendency of both poorly and we'll performing stock to continue the same trend. It is due to the momentum investors who have the tendency to chase performers. Thus if a stock is performing well, these investors invest more in such stocks and increase the price of the stock further thus keeping the same trend. And if a stock is doing bad, these investors sell this stock decreasing the price of the stock further. Thus they remain as poor performers next period as well

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the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.