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The team, led by Vincent Chalgneau, the bank’s head of fixed-income strategy, and Guy Stear, its head of emerging markets, concluded that a Trump victory would likely hurt emerging-market currencies as investors brace for more protectionist trade policies in the U.S. Indeed, many emerging-market currencies are already responding to tightening election polls, it appears. The correlation can be seen in the graph below:

source: http://www.marketwatch.com/story/heres-how-the-us-election-might-impact-the-currency-market-2016-09-09

What does "tightening" mean in the phrase "tightening election polls"?

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    The gap is becoming smaller. The vertical legend on the left side has a minus sign, thus, the plotted value is a difference (support for candidate A minus the support for candidate B set against the plotted values of currency fluctuation). – Tᴚoɯɐuo Sep 12 '16 at 10:51
  • Definition #11 in the Oxford Learner's Dictionary definition of tight may be helpful. If you look over the other definitions, you can see that tight/tighten has a quite a few different meanings depending on what you're talking about. Tight also is used as slang to describe something that is really great. – ColleenV♦ Sep 12 '16 at 17:47
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It simply means that the difference/distance between the competitors/contenders is narrowing down, getting smaller.

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