Once Upon A Time: What can You Make Out of this Story. Smart People Will Learn The Lesson

Once upon a time in a village, a man
appeared and announced that he would buy

monkeys for N100 each. The villagers seeing
that there were so many monkeys around,
went out to the forest and started catching
them.
The man bought thousands at N100 and as
supply started to diminish, the villagers
stopped their efforts. He further announced
that he would now buy at N200. This renewed
the efforts of the villagers and they started
catching monkeys again. Soon the supply
diminished and people started going back to
their farms. The offer rate increased to N250
but the supply of monkeys became so little
that it took much effort to even see a monkey,
let alone catch one.
The man now announced that he would buy
monkeys at N500! However, since he had to
go to the city on some business, his assistant
would now buy on his behalf.
In the absence of the man, his assistant told
the villagers: ''Look at all these monkeys in
the big cage that my OGA has bought from
you, I will sell them to you at N350 and when
my OGA returns from the city, you can sell it
to him at N500''.
The villagers squeezed out all their HARD
EARNED savings and bought all the monkeys.
The most greedy ones among them even sold
their lands to purchase many MONKEYS,
hoping to make a huge profit without labor.
Then...
They never saw the man or his assistant. Only
monkeys everywhere!