I remembered that when I was little, we used to have a coconut
tree in our backyard, every time when the coconuts were ripe; a guy will knock
on our door and offered help on picking the coconuts for us for free in exchange
of some coconuts from us.
Long time ago, when the money
was not invented yet, people grow fruits, vegetables, raise pig, chicken and so
on, and then they trade with each for needs.
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