An artist who was part of an exhibition, asked the gallery owner if his paintings, currently on display, were attracting a reasonable amount of interest.

“I’ve got good news and bad news,” the owner replied.

“Give me the good news first,” the artist demanded.

The good news is that a gentleman inquired about your work and wondered about their value in the future, after your death. When I told him that in such a case it would astronomically increase, he bought all 15 of your paintings.”

“That’s wonderful!”, the artist exclaimed, “What could the bad news possibly be?”

With concern, the gallery owner replied, “The gentleman in question was your doctor.”

_{(Available at: http://www.english-magazine.org. Retrieved on: July. 5, 2011. Adapted.)}

The main aspect illustrated in the text is: