The new law will, she argues, make it "more difficult" for those people and may reduce the "pull effect" now and beyond Spain's financial crisis.

BBC: Spain's migrant healthcare dilemma

However she also says Spain's free public health system has contributed to a "pull effect", making it "very attractive for immigrants, especially illegal ones, to come to Spain".

BBC: Spain's migrant healthcare dilemma

It is the pull-forward effect of consumer demand, and it has to be pulled (at least to some extent) out of the future.

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In situations of great ambiguity and uncertainty, first offers have a strong anchoring effect they exert a strong pull throughout the rest of the negotiation.

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And the reason seems to be that gluten has such a damaging effect on the stomach villi (the fine strands that pull nutrients from your food) that you get less and less value from what you eat.

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Bank chief executives rationally have to pull back on lending in light of increased risks, Dimon says, a spiral effect the government is trying everything in its power to break.

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On top of that, there are occasional moments where the developers pull a few surprises and push the images out of the screen, introducing a cinema-like effect that is very impressive.

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The prime minister has been running a campaign suggesting that the Tories have a secret agenda to pull Britain out of Europe and want a "no" vote in the UK because it could have precisely that effect.

BBC: Analysis