一道简单的金融问题

Although clarifications of the country in question and the term "wider spread" are needed.

I will take it as China's domestic money markets. Without fully understand the demand of your question. A few factors, i shall recommend are

1.Increased participation of ordinary people in the money markets. i.e. more active management of money than saving in banks.

2.Continued economic success which generated excess liquidity.

3.Relatively relaxed money policies by China People's bank in the past few years.

4.The recent subprime mortagage crisis hit the international financial market relatively harder than the domestic market.

Industry revenue, exports, imports, wages and number of companies in the industry, Industry growth and geographic regional data

流动性过剩。excess liquidity.

偶经常关注金融，经济类毕业的。

hot money

appreciation of Chinese currency(RMB)

interest rate difference