Listing a property for rent ethical question...

[Joe T.]

I know I can rent my property out for $1200 a month. I've been looking at comparable properties in the immediate area, and I have found that some are charging $1300+ for the same sq ft and bed / bath. My question is that.. is it legal to list a property for $1200 a month, and if I get too many responses, increase it to a higher price? I don't want to wait a month or 2 to get the higher price, but I also want to get the best price I possibly can.