For certain products you may want to offer the customer a choice of how fast they want the product produced and, in the case where the customer requires very fast production, you want to increase the price for the product.
wp2print offers a "Production Speed Multiplier" that will perform these actions for the product:
In the example below, you can see the price and date shown to the customer in the product page for 2 different selections for 'Production speed'. Note that the price for 'Next day' is 50% higher than the price calculated for production speed 'Slow'. Note also that the 'Ship date' for 'Next day' is 3 days earlier than the 'Ship date' for 'Slow':

