Buy rate is a web proxy metric that measures the rate of users who purchased a product / the users who were exposed-viewed to the product.

To best measure each product's exposure in pageviews is calculated as the sum of product page pageviews AND the product's category pageviews.

Buy Rate = web orders / (product pageviews & category of product pageviews)

example:

SUNSCREEN PRODUCT 50ML	1.000 product page pageviews
SUNCSREEN CATEGORY	5.000 category pageviews
Buy Rate of SUNSCREEN 50ML = web orders / (1.000 + 5.000)

Buy-Rate: What is it? What is the expected behaviour for this metric?