For several years I've bought the tiny "sample" size of Dawn because the cost per ounce wasn't much different than the big bottle but mainly because about the time its spout was getting nasty it was empty and I could toss it and open a new full bottle with a clean spout.
They've risen in price from $1 each to $1.22 in the last 2 years, a 22% increase in price for the same volume but here's the latest, bought last week: the price is still $1.22 at Wally World BUT the size has shrunk from 7.5 oz. to 5.8 oz. , a 22% decrease in volume for the same price! The only "good news" here is that there is a noticeable difference in size unless you're not paying attention.
So that's 44% total shrink-inflation for this product in 2 years...22% cost increase, 22% volume decrease.
Thanks, Brandon!