Picture a rope quietly strung across a market. Nobody official put it there — the people already inside agreed to string it up, and it saves them from having to compete or share. Anyone outside who wants to do that work finds the way is closed. Both meanings of restrictive practices describe that rope: a private arrangement that fences off what other people are allowed to do.
可以想成在市場中間，有人悄悄拉起一條看不見的繩子。繩子不是政府拉的，是圈子裡的人自己講好拉起來的。繩子內側的人日子好過，因為不必真的去搶、也不必真的讓位。被擋在外面的人想進來做事，卻怎麼也動不了。restrictive practices 的兩個意思，都在講這條繩子：一個私下講好的安排，把別人能做的事先圍了起來。
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