How collates the data at price comparison sites ?

3ukman3ukman subscriber Posts: 7
edited December 2008 in Business Planning
Who collects/collates data for sites like , ,
These sites compare the price of an item found on multiple independent online shops !? How do these comparison sites obtain/collate all this data  ? Are there actual people that monitor each site / item / price and update prices ongoingly OR, do these sites enter in contract with each  shop and have pricing data delivered electronically .i.e database , web-service , excel sheet etc. ?3ukman12/4/2008 8:33 PM
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