It might not affect the price at all as the price is mostly controlled by an accumulation/distribution cycle of whales.
You know about as much about economics as John Snow.
http://www.thefrisky.com/wp-content/uploads/2013/06/03/you-know-nothing-06-0313-400x300.jpg
On-topic:
I guess if amazon accepts bitcoin it will have a positive effect on price and as well on the amount of sales on amazon. It'd be good for both parties.
But i think amazon will wait a while before it will accept bitcoin. The larger the company the longer they wait with new technology.