We know that there are several factors that influence the price elasticities of supply and demand.  One of these factors...

We know that there are several factors that influence the price elasticities of supply and demand.  One of these factors would be the time element involved.  There are some products that producers would like to sell before a certain date and consumers basically would only want to purchase prior to that same date.  Explain what this means with respect to the price elasticities, what that suggests about the pricing of the product, and provide an example (one example could be Christmas trees until Christmas Day).