Over the past three years , the number of christmas decoration manufacturers in yiwu has snowballed from 80 to 600 .
过去三年来,义乌圣诞装饰品制造商的数目已从80家猛增至600家。
Wang yiwu , an academic at hainan university , feels the island 's property market in 2010 it recorded the fourth-highest average house price in the country according to official data is not a bubble yet but he admits it has problems .
With wages rising 20 per cent a year in yiwu , the renminbi appreciating , raw material prices soaring and an acute shortage of migrant labourers , fisher says he had no option but to go upmarket .