Of course they do - that's what pricing mechanisms are all about.
I'm not sure why Internet usage should be exempt from this. (in the
UK we pay for all local calls, which provides a moderate incentive
not to over-consume. However at Christmas some phone companies gave
free local calls and as a result some people could not get a local
line because other people were4 staying on all day.)
NB: I shall be "offline" for
much of the period 10-27 January,
but emails and faxes to +44-1904-424381
will be dealt with on my return.
QED of York
1 Straylands Grove
York YO3 0EB, England
Tel: 01904-424242 Fax: 01904-424381
QED now has two offices. QED in Welwyn deals with personal and
school orders - phone 0345-402275 or Email QEDBooks1
QED in York deals with Trade orders and discounts (address above).
We can supply all your needs relating to mathematics or science