Nope! Generally, both supermarkets and wet market stalls purchase fruits from wholesalers, who likely buy from other wholesalers. The papayas at 1 stall could realistically be from many different farms, as they are sorted based on appearance/size.
This means a few things:
1) There are several middle men between you and the farmer - if you think you are buying cheap fruit, imagine how much (little?) the farmer must have been paid!
2) No one at the store will know how the produce was grown, and will look at you funny if you ask
3) We're much fresher! And likely much closer to Singapore compared to other farms