Means testing - An Australian friend of mine once told me his Dad was in favor of paying the minimum necessary to keep the lower classes from revolting.  It is in the upper classes interest to do so.  History proves him correct.  Personally, I would lift the current SS cap and make all earned income regardless of how much one earned subject to the pay-roll tax.  If someone who earns $45,000.00 per year has to pay the full payroll tax, so should someone who earns $4,500,000.00 per year.

Raising retirement age -  When I was a boy, my full retirement age was 65 it is now 67.  I'm sure my kids full retirement age will be even higher.

Indexing to inflation is the fair thing to do.  It ensure one's purchasing power is always maintained.  Unless the calculation for inflation is a lie.

Fair Tax -  The meat of Johnson's economic plan.  It is a total revamping of the tax system:  https://en.wikipedia.org/wiki/FairTax