A method of conducting sales over the computer internet where the prices of the merchandises are dynamic functions of time instead of static rational numbers. In one embodiment, this method and system is a free market place that's able to conduct single-unit or multiple-unit sales of products and services from multiple sellers. In this market place, negotiation of the price does not require either side to make arbitrary offers, and further, with a large pool of prospect buyers, the true, current market value of the on sale products and services can be automatically reflected and updated through the purchases made.