While too much sodium is associated with cardiovascular problems, too little potassium can have the same effect, so potassium chloride has a doublebenefit.
The plan to invest some of the Social Security trust fund on Wall Street purports to address this: real assets would henceforth back the promise and, you might think, there is a doublebenefit because returns on Wall Street are higher than returns on the fund's existing portfolio of bonds.
An employee who earned 3% more in their 401(k) during their working career due to this employee benefit could double their 401(k) balance at retirement.
He told his fellow MPs that in principle the SDLP wished to end double jobbing, but he believed there was a benefit in party leaders having a role at both Stormont and Westminster.
It wasn't uncommon for monitors to sell for below what it cost to make them--the benefit being that sales in 2001 were about double that of the previous year.
The key to double dipping is to take the two benefits at different times and not lose anything because the benefit you take last has risen thanks to its actuarial increase.
Annette gets no benefit to make up her loss from the South African Government but others might and they could not get double provision out of the case.