Peter, is that true for non-OECD countries? Many poor Brasilians are on the Net and 5¢ is not negligible to all those users. Clay Shirky also mentioned the "ps

Peter, is that true for non-OECD countries? Many poor Brasilians are on the Net and 5¢ is not negligible to all those users. Clay Shirky also mentioned the "psychological cost of deciding" in an article linked in another comment. But what's the (quantitative) evidence for these statements?