If a mega national corporation passes along the tax increase to consumers in general, then Oregonians would get a great deal. Let's say a company pays the 2.5% tax and passes the cost to consumers by increasing pricing. Oregonians are ~1/100th of the US population, so a national pricing scheme would increase prices by .025%, barely a blip to any Oregon consumer. That's a 100:1 return for Oregonians as a worst case scenario for a mega corp with national pricing schemes... a great deal!

I don't even know where to begin though if you are asking if companies use pricing elasticity as part of their pricing strategy. Of course they do. Apple iPhones are constantly priced throughout a year even though currency exchange rates and cost of good fluctuates throughout the year. If every change in price gets passed to the consumer there would be weekly price changes... there are not. 

So, what percent of sales in Oregon would be affected by this tax? That's something I would like to know.