One day, a monkey carrying a persimmon seed noticed a crab
with a rice ball in its claw. The monkey was very hungry, and
so asked the crab to trade the rice ball for the seed. The crab
thought this an unfair trade and refused. But the clever monkey
said to the crab, "Once you eat the rice ball it will be gone
forever, but if you plant the persimmon seed, it will grow into
a tree and bear a never-ending supply of fruit." The crab was
persuaded, and the monkey got the rice ball.