You overhear the following statement on the street in California: "My house is just like my neighbor's house, and our lots are about the same size - but just because I bought my house more recently, my property tax bill is lots higher! That isn't fair!"

Which of the following principles or concepts is most clearly violated by this speaker's tax situation?

A. efficiency

B. vertical equity

C. horizontal equity

D. benefits principle

E. deadweight loss