AGF's shareholders a choice between FFr320 in cash for each share now, or a guaranteed price of FFr360 on shares held until 2000.

ECONOMIST: Insurance

Ever since the 1960s, Fapesp has been guaranteed, by law, a fixed share of all the tax collected in Sao Paulo (first 0.5%, later 1%) and independence from the political meddling that is endemic in Brazilian public institutions.

ECONOMIST: Brazilian science

Now that the market is comfortable with Android, the commodity strategy is almost guaranteed to earn a huge slice of market share.

FORBES: Android's Downward Pricing Will Force Google's Advertising Vision On Every Manufacturer

Guests pay an agreed donation - often in advance to cover "no shows" - providing the artists with a guaranteed income, often more generous than their share from a larger commercial event.

BBC: House concerts bring magical music into front rooms

Japan has always had an unusually low unemployment rate, never hitting over 5.3% partly because of its policy of guaranteed employment in urban areas that forces workers to share jobs to keep more people employed.

FORBES: Obama's Health Care Reform Tactics

So if players revenue share is falling by 5-6 percentage points, nearly half of their reduced share is strictly due to reallocating less money towards guaranteed money for rookies.

FORBES: Who Won The 2011 NFL Lockout?

As a share-based investment, this is more risky than a cash account, because returns are not guaranteed.

BBC: A child on a beach