Perched in front of a computer in a one-room apartment in Gaobu, Ms Wang opens the social security website, enters her personal details, and calls up her pension payment record.
The screen says she has paid into the pension for 85 months. She then points to a printed record from a recent visit to the social security bureau that says she has only contributed for 35 months, and laughs.
“If you ask 10 workers, nine don’t understand what is on the forms,” says Ms Wang, an alias for one of 40,000 workers who recently joined the biggest strike in China in decades.
Workers at Yue Yuen Industrial, which makes running shoes for Nike and Adidas at a factory complex in Gaobu, said it underpaid their pensions for years.
After 11 days of protest, the Dongguan municipal government handed them a rare victory by saying the company should have based contributions on a higher pay level. Yue Yuen estimates it will have to pay an additional $31m just this year after agreeing to base pension payments on total pay, including overtime.
The strike cast a harsh spotlight on Yue Yuen, the biggest employer in Gaobu, one of many towns that form the manufacturing metropolis of Dongguan. But workers, labour activists and factory managers say the practice is widespread in the Pearl River Delta – the workshop of the world – in south China.
Local governments are allowing companies to pay lower contributions than required as they fear their leaving, particularly as factories face double-digit wage rises each year.
“The government has been keeping one eye open, one eye closed all along,” said one Yue Yuen worker. “It did not want to put too big a burden on the factory, since it wants foreign investment.”
In 1997, China introduced a national pension system that requires employers and employees to contribute. Companies should make payments as a percentage of total pay, but many use a lower figure that does not include overtime. Factory workers often earn several multiples of the minimum wage through extra hours.
Zhang Zhiru, a labour activist who was detained by police for helping Yue Yuen workers, says local governments allow companies to underpay pensions as long as their calculations are based on a higher figure than the minimum wage.
Factory managers said the practice was common. One said that Dongguan required his company to make payments for only 55 per cent of its workers, and added: “The base for calculating contributions should have been raised to Rmb2,138 ($342) from Rmb1,813 in 2012. But most factories still use the lower number and the Dongguan social security bureau has been acquiescing.”
Adidas said Yue Yuen’s payments were “in accordance with an agreement which they had reached with the Dongguan authorities”. Yue Yuen has denied breaking any laws. Asked about deals with companies over payment levels, a Yue Yuen spokesman said it was a “prevalent practice”.
“Yue Yuen has given local governments in the Pearl River Delta a real headache,” says Mr Zhang. “How do you solve the pension problem?”
The pension issue has not previously sparked as much unrest as that witnessed at Yue Yuen. One reason is workers are reluctant to contribute due to difficulties transferring pension when they move cities – a big problem given the fluid nature of the labour force.
Zheng Bingwen, an adviser to the Chinese labour ministry, says in some cases when workers move, the government in their new district must fund the portion of the pension that could not be transferred, creating a reluctance to accept accounts.
Professor Mu Guangzong, of Peking University’s Institute of Population Research, says: “The social security system is fragmented. It’s like the Beijing metro system – lines are not well connected making transfers very difficult.”
Sitting in a café near Yue Yuen, one furniture factory worker in his early twenties says many young workers have not worried about pensions. “I don’t really care about the pension issue, as I’m really young. I won’t spend my whole life in a factory,” says the man.
A friend chimes in that “most young workers think the same way, which is why nobody at Yue Yuen checked their pensions”, but that more are now paying attention. He says some of his co-workers have recently found similar problems, but are of unwilling to start a strike out of fears that they would be fired.
“Since Yue Yuen, many people have gone to print their pension records,” says Ms Wang. “I waited for an hour to print mine. In -normal times, nobody would be lining up.”
Additional reporting by Julie Zhu
裕元工业（集团）有限公司（Yue Yuen Industrial，简称裕元集团）的工人表示，该企业多年未给他们足额缴纳养老金。裕元集团在高埗镇拥有一座大型工厂，为耐克(Nike)和阿迪达斯(Adidas)生产运动鞋。
北京大学(Peking University)人口研究所(Institute of Population Research)教授穆光宗表示：“目前社保系统是碎片化的。就好像北京的地铁系统一样，线路之间衔接得不好，使得换乘非常麻烦。”