What is Betterment Act?

Legal Definition
a law where the permanent improvements to a property that increases its value are recoverable by the occupant being paid by the owner.
Legal Definition
Statutes which provide that a bona fide occupant of real estate making lasting improvements in good faith shall have a lien upon the estate recovered by the real owner to the extent that his improvements have increased the value of the land. Also called "occupying claimant acts." Jones v. Hotel Oo., 86 Fed. 386. 30 C. C. A. 108.
-- Black's Law Dictionary