<pre>
At one time, the Canadian and US dollars were discounted by 10 cents on
each side of the border (i.e., a Canadian dollar was worth 90 US cents
in the US, and a US dollar was worth 90 Canadian cents in Canada).  A
man walks into a bar on the US side of the border, orders 10 US cents
worth of beer, pays with a US dollar and receives a Canadian dollar in
change.  He then walks across the border to Canada, orders 10 Canadian
cents worth of beer, pays with a Canadian dollar and receives a US
dollar in change.  He continues this throughout the day, and ends up
dead drunk with the original dollar in his pocket.

Who pays for the drinks?

[[RecPuzzlesExchange Solution]]
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