主题：【原创】为何中美人均可支配收入差距远大于人均GDP差距 -- 常乐

引用wiki上美国统计局2010年的数据外链出处

家庭年收入 所占百分比

Under $5,000 3.52%

$5,000 to $9,999 4.11%

$10,000 to $14,999 5.89%

$15,000 to $19,999 5.68%

$20,000 to $24,999 5.86%

$25,000 to $29,999 5.44%

$30,000 to $34,999 5.51%

$35,000 to $39,999 5.07%

$40,000 to $44,999 4.79%

$45,000 to $49,999 4.08%

$50,000 to $54,999 4.27%

$55,000 to $59,999 3.51%

$60,000 to $64,999 3.66%

$65,000 to $69,999 3.17%

$70,000 to $74,999 2.98%

$75,000 to $79,999 2.85%

$80,000 to $84,999 2.51%

$85,000 to $89,999 2.12%

$90,000 to $94,999 2.14%

$95,000 to $99,999 1.86%

$100,000 to $104,999 2.09%

$105,000 to $109,999 1.46%

$110,000 to $114,999 1.42%

$115,000 to $119,999 1.30%

$120,000 to $124,999 1.27%

$125,000 to $129,999 1.04%

$130,000 to $134,999 1.00%

$135,000 to $139,999 0.76%

$140,000 to $144,999 0.85%

$145,000 to $149,999 0.74%

$150,000 to $154,999 0.96%

$155,000 to $159,999 0.61%

$160,000 to $164,999 0.58%

$165,000 to $169,999 0.50%

$170,000 to $174,999 0.51%

$175,000 to $179,999 0.44%

$180,000 to $184,999 0.38%

$185,000 to $189,999 0.30%

$190,000 to $194,999 0.31%

$195,000 to $199,999 0.26%

$200,000 to $249,999 1.90%

$250,000 and over 2.32%

以每5000美元为一档分组，除了年入10000美元以下的贫困家庭，其余百分比几乎就是一路减少。可以说，美国的家庭收入是非常标准的金字塔型。所谓橄榄型的收入分布完全是谣言。

那么橄榄型的说法是怎么来的呢？我猜测是来自＂中产＂的定义。同一链接里也给出了各种对＂中产＂的分类。综合来讲，就是把收入最高的1%-5%的富人去掉，收入最低的40%多的穷人和Working class去掉，剩下的45%-50%的人就是中产。

问题来了，如果把中间45%-50%的人都装到一个筐里不加以区分，不管怎么样看，都会看到一个橄榄。。。

而事实上，年入3万就能算成下中产，年入10几万也是上中产，真能放进一个筐么？