why do vouchers have expiry dates?

this is something i do not understand – why would vouchers expire?   i don’t mean the special offer vouchers that you get in the junk mail, or cut out of magazines. i don’t  include  the free accommodation vouchers that a hotel might hand out which is only valid for a specific period of time…

so far so good!

today has started off very positively. mainly, i think, because i was so productive last night! i tackled the piles of paper that collect on flat surfaces all around the house, and got some order to them. so that in the next instalment i can start filing, putting into newly created spaces (i.e. hang up…