What do you do when you realize that a company has reduced its package size, but not necessarily its price?

"Which brands have you noticed reducing their package sizes?  How does it make you feel?"

I purchase a different brand instead (28.2%)

I consider the cost per weight of each competitive brand (63.1%)

I purchase it anyway (8.7%)

I don't buy the product altogether (8.7%)

What do you do when you realize that a company has reduced its package size, but not necessarily its price?