When we are expecting guests, we buy new soap, usually several bars. The top (upside down) bar was one I had just opened about a week ago from a previously purchased box. When I opened a new package to put out fresh soap, I realized the size was smaller! Yep, I believe they didn't raise the price; they just shaved the product. Result? Raised the price.
I'm not picking on just this one brand - it happens everywhere.