Copy this from another forum to share here. Enjoy...

One day, an old man and his assistant arrived at a farming village. The old man gathered all
the villagers and told them that he is in the business of buying and selling monkeys and that
the reason why he has come to their village is becoz there is a forest next to that village
which is infested with lots of monkeys. He told the villagers he would pay $10 for every
monkey they bring him.

So some of the villagers started to stop work on their farms to go into the forest to catch
monkeys. They brought their monkeys to the old man and true enough, he paid them $10
for every monkey. Words spread and not long after, more and more of the villagers stopped
working on their farms to go into the forest to catch monkeys. And they were all paid $10
for every monkey they delivered to the old man.

Becoz more villagers were now monkey hunters, it became more and more difficult to catch 
monkeys as their numbers started to dwindle. The supply of monkeys started to come down.
So the old man gathered all the villagers and told them he would pay $20 for every monkey
they bring him. Wow! That sounds great and the villagers started to drum up the beat to
look deeper into the forest and higher into the trees to look for more monkeys. And they
were paid $20 for every monkey they caught and everyone was happy. 

As more and more villagers turned monkey hunters, the monkey population in that forest
started to dwindle very significantly and it became increasingly difficult to catch even
one monkey a day. As such, the villagers started to return to their farms to work.

Once again, the old man gathered all the villagers and told them that as he is running out
of time and he needed more monkeys, he would up the stakes and pay $50 for every monkey
delivered to him. He also told the villagers that as he has to leave the village for a few days
to attend to some business in town, they can deliver the monkeys to his assistant and his
assistant has been instructed to pay $50 for every monkey caught.

The villagers got all excited and went deep into the forest to look for monkeys but by this
time, there were no monkeys to be found. The villagers approached the assistant and told
him the $50 offer is wonderful but the monkeys were simply not there.

That assistant then said to the villagers......"I know there are very few monkeys left in the
forest. But here in my cages, I have thousands of monkeys. Tell you what...why not you
buy these monkeys from me at $35 each. Then when the old man comes back, you can 
sell your monkeys to him for $50 and make $15 each." 

Wow! That sounds like a great idea...the villagers thought. So they bought as many monkeys
as they could from the assistant at $35 each.

After that day, the villagers never saw the old man or his assistant again.
 

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Thanks TT for the transcript.