yes
An example of a ceiling would be rent controlled apartments. A floor would be minimum wage.
No, use different currencys but it is slightly cheaper in Brazil. Does this help?
no discounted price is the price after some money has been taken off the sale price for a sale etc. but sale price is the original price
The market price is the current amount the stock is selling at on the New York Stock Exchange, the AMEX or any other global exchange.