Answer:
There is none, it has been reprecented as the American dream for so long and people believe it. Same as wedding ring the only reason it expanse because one rich family hold the business and decide the value. it started in the 90s or the 80s I don't know they ran ads that say if your husband does not buy you a wedding ring either he is cheap or doesn't love you enough. From their wedding ring value went up.
Explanation:
