Replying to Why is my money worth more in Canada?

WHy is US money worth more in Canada? There is an exchange rate so my money should be worth the same right? Like I buy a box of pop tarts in America for $2.50, the same box in Canada is prolly $3.75CA (assuming the exchange rate is .5). So if I go to Canada I still pay the same amount for the same thing right? One more example, I paid like $1200 for a sess at HN, a Canadian kid paid maybe 1800 (1200x1.5=1800), so we both paid the same amount really, right? Someone please explain how I am wrong?