Do the following sentences have the same meaning?
a. The economic situation is better than before.
b. The economic situation is better than it used to be.
c. The economic situation is better than it has been before.
I learned the word "before" is used in present perfect, not in past tense because it refers to the time span from a certain point in the past to now. Is it OK to use "before" in past simple? Can we say "The economic situation is better than it used to be before"?