Buddy, actually you have answered your question all by yourself intentionally or unintentionally.
Let me repeat here,
人们不自己生产, because 费时费 力.
It doesn't mean you couldn't.
Since it 费时费 力,
few of us doing so.
Based on your limited information,
it is hard for someone to make a pan, a pile of paper, a radio or even a bulldozer himself/herself.
It is simply impossible in reality.
Anyone without education could draw the identical conclusion.
Don't forget the goal of education.
To make the world a better place to live, isn't it?
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