
The party said on Monday that its survey compared prices and income from 2007 to last month.
It found that one of the city's poorest areas - Tin Shui Wai - has the most expensive food, with pork and beef prices more than 50 per cent dearer than in other districts.
Tam Chun-yin, the party's community officer, called for the government to introduce a negative income tax to subsidise people earning below a certain amount, to help them survive amid high inflation.
Tam said: "We believe the exorbitant food prices in Tin Shui Wai are caused by a lack of market competition. The government should build public markets there as they do in other places."
All six markets in Tin Shui Wai are run by the listed group Link Reit, a real estate investment trust. In other districts there are markets managed by the Food and Environmental Hygiene Department.
The survey, conducted in January, covered 30 markets in different parts of Hong Kong, looking at prices of 16 food items including rice, pork, beef, chicken, fish and vegetables. Surveyors then compared the average prices to prices recorded by the government in 2007.
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