An extremely short summary. The kind of summary that can be used when you're going up or down in an elevator, and can explain the matter during those few seconds
I was in an elevator and had 40 seconds to explain my proposal to a billionair investor.That was the only period which I was allowed to me by the investor. So I used an elevator summary by telling him "I have a scheme which can save you millions of dollars. You only have to invest few thousand and spend 2 days in my holiday resort. The returns are guaranteed and vouched by Mr. ..."