| http://www.w3.org/ns/prov#value | - Here, in a case that the pay program is a program for delivering a music content, and in a case that a pay-as-you-use charging system of charging depending on the number of musics of the received music content or a receiving time period of the pay program is adopted, the pay spent by then is a waste of money, and therefore, being extremely uneconomical.
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