论文部分内容阅读
A stam p is just a piece of paper w ith a picture and som e w ords printed on one side. W hat m akes one of these bits of paper w orth any m oney at all? W hat m akes a ten-fen stam p w orth ten fen? W hen you buy a stam p, you also buy service from the p
A stam p is just a piece of paper w ith a picture and som ew ords printed on one side. W hat m akes one of these bits of paper w orth any m oney at all? W hat m akes a ten-fen stam pw Orth ten fen? W hen you buy a stam p, you also buy service from the p