Or in other cases, studies with negative conclusions may neverbe published, so next time you'll hear a piece of advice about what you should or shouldn't be eating or drinking, consider the source.
Series I bonds consist of two components: a fixed interest rate return and an adjustable inflation-linked return, making them somewhat similar to TIPS. The fixed rate never changes, but the inflation return rate is adjusted every six months and can also benegative (which of course brings your total return down).
Thus do the most respected players in the charity game reinforce the idea that overhead is negative and intrusive, not really part of the business of charity because charity never was or will be a business.