There is a short-run trade off between inflation and unemployment. When the growth rate is greater than 10%, it will normally be accompanied by very high inflation.The central bank will then correspond by raising interest rate, which will depress the growth rate.

So 10% in this sense is not a magic number. Since it is calculated in a compound fashion already, a 10% growth could be a sign of an overheated economy. 

我是不同意楼上的观点，我认为那个10%，似乎有一些理论根据。只是本人没有发现而已。

失业超过10%的时候，人们通常难以承受，通胀率也一样。这是为什么呢？前者削弱了10%的就业，好像减少了10%的收入，而后者虽然没有失业，倒是感觉也减少了10%的收入。而10%的增长似乎是社会资源难以长期承受的，这个社会资源也可以是人们的心理承受界限。