The value-to-price ratio (WPV) is a key figure for the value for money of a product. It results from the quotient of the value in use (W) of a product estimated by the customer and the price perceived by him (P):
WPV = W / P
The customer will only buy the product he or she is looking for if it seems inexpensive to him. This is the case when the value-price ratio is at least 1. A product is not cheap (too expensive) if the WPV is less than 1. the
The upper price limit for a product is generally where the WPV is equal to 1.
English 
German 