Mr Ahern said it had proved a positive effect not only on the health of the nation, "but also on the functioning of our health services".
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Two kinds of policy in particular have been proved to have a big effect on poverty, aside from their influence on overall growth.
But until now evidence of a similar effect on humans has proved inconclusive.
These ticket-holders were limited in number which proved the laws of scarcity in effect: few items available of a buzzworthy thing mean a race to get your hands on it before anyone else does.
The road is littered with discarded vitamins and minerals that made perfect sense but proved to be digested and excreted without effect.
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In any case, the iPod shuffle has proved the product's vaunted "halo effect" in that, when Apple introduced its new iPod in January, everybody stopped talking about how many copies of Halo 2 Microsoft shipped during December.
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IMF, has proved to be very expensive, especially as aid to effect structural adjustment programmes and enhance and support economic growth was suspended in 1990.
That began to happen during the first quarter of this year, when a rising trade imbalance proved a modest counterbalance to booming domestic demand, and its effect is intensifying as the trade deficit widens.
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They proved that it cannot, as some had suspected, be an effect of Venus's atmosphere.
Frans Johansson, the bestselling author of the Medici Effect and his new book, The Click Moment, proved to be an entertaining and inspiring speaker.
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The molecule later named fingolimod proved to be the standout, significantly prolonging survival due to its immunosuppressant effect.
EU's savings directive, designed to squash tax evasion by individuals within Europe, took effect in 2005 after a decade of wrangling, but has proved something of a flop.
Mr Netanyahu's experience proved that under the current Israeli system of government, which came into effect in 1996, even unpopular prime ministers are invulnerable, at least for the first half of their term.
The banks were not overjoyed, because this in effect did away with banking secrecy in such cases, but it proved to be a turning point.
The most fundamental one remains the Baumol effect: labour-intensive services, such as nursing and teaching, have thus far proved as immune to productivity-enhancing technology as string quartets.
So far the effect of SARS on the UK has been limited to just three probable cases, none of which has proved fatal.
But we drew another conclusion, both from the New Deal experience and especially the Great Society era which expanded on it, that has proved to be less defensible: that social programs of all types can be managed or funded by government to good effect.
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