Assessing Sufficiency

We arrived at the park gate at 7:25 p.m. at which time the cashier gleefully took money for admission. Upon entering the zoo and walking across the bridge, the loudspeaker was stating that the zoo buildings were closing at 8:00 p.m. We asked if we would not get a pass for the following day. The answer was no. It is easy to see that this city is anything but friendly, but is only interested in raking money out of tourists.

Example from Trudy Govier, A Practical Study of Argument, 6th Edition. Thompson, 2005.