double-blind study - an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; a double-blind procedure is used to guard against both experimenter bias and placebo effects.
No they get more expensive, airlines will always advise you to book in advance to take advantage of their best fares. Sometimes they do a special deal but not within a week of flying. I would try another airline or make different plans.
If you are thinking of booking your next overseas holiday today, think again. Friday is the most expensive day of the week to buy a plane ticket, according to new research, with flights on average 13 per cent dearer than if booked on a Sunday. Customers have previously been advised to book plane tickets on a Tuesday because they were most likely to find a bargain.