Input: cost, average call cost per click.

(Under the same conversion rate, the lower the ppc, the higher the click volume and the higher the output. )

Output: customer unit price, conversion rate

(The higher the customer's unit price, the higher the natural output, or if you buy one or more goods in a single order; The higher the conversion rate, the more transactions and the higher the natural output)

Examples of extended information: buy baby, promote through train. The background statistics of seven days a week are as follows: through train to 400 yuan, turnover to 800 yuan; Then the ROI of this week's through train is 400: 800 = 1: 2.

Through train ROI critical value = 1: selling price/gross profit. Assuming that the gross profit of goods is 200 yuan, the cost is 400 yuan, and the critical value of ROI is = 1: 2, that is to say, the promotion of through train is guaranteed by the conversion rate of 1: 2.