"You know, exchange offices are private
companies and as such can offer whatever rates
they want to, to their customers.
This
means, that if you have five exchange offices
next to each other, they could all offer you
different rates for the same currency.
And
it's even more complicated, because one office
might be good for changing Euros but terrible
for changing dollars and the next office might
be the opposite.
Now,
all the people who were exchange office clerks
before are tourists now and all of the people
who were tourists before are exchange office
clerks, now.
BUT,
this time, each exchange office gives
different rates and the customers complain
or negotiate a better deal."