Advertising Tip#10: USE TAKEAWAY SELLING TO INCREASE THE URGENCY
When you limit the supply of a product or service in some way (i.e. takeaway selling), basic economics dictates that the demand will rise.
In other words, people will generally respond better to an offer if they believe the offer is about to become unavailable or restricted in some way.
And of course, the opposite is also true.
If a prospect knows your product will be around whenever he needs it, there’s no need for him to act now.