Of all the rights you should insist on, this is a very important one ABOUT WHICH YOU CAN DO ABSOLUTELY NOTHING. Because banks and market makers refuse to recognize this issue. Because it flies in the face of yet another antiquated tradition. And because—for traders who never or only rarely keep a position open overnight (that's some 90% of you)—it just doesn't seem to matter.
Standard practice today is that the interest rate attached to any currency only matters if you keep your position open from one day to the next. Your market maker will require you to do a rollover swap, and part of the cost of that (unnecessary) transaction is the difference in interest rates between the currency you're buying and the one you're selling. No matter how your position may have changed during the day.
This is like your electric company ignoring your power usage during the day and basing your rate on how much you happen to be using at 8 PM.
Removing interest rates from the trading decision is just plain foolish. If you pretend that currencies as diverse as the Euro, the U.S. Dollar, the Argentine Peso and the Polish Zloty are all the same, you're ignoring a basic risk that can kill even a short-term trade.
By removing interest from the buying and selling equation, the market creates an artificial bias toward shorting weaker currencies (with higher rates of interest), and, potentially, rewarding buyers of stronger currencies (with lower rates of interest). The result? Distorted pricing flows that upset trends, create valuation havoc, and encourage speculation for its own sake.
Or, what if you just don't get around to closing your position before the end of the day—or you'd like to keep it open without the rigmarole and unnecessary cost of the rollover swap?

Interest rates should have a positive effect on trading flows. But that's not
how it works in the forex market. During the day they skew prices by
encouraging speculation on weaker currencies. At the end of the day they
lead investors to make -- or not to make -- trades for the wrong reasons.
However you look at it, discrete interest makes for bad trading decisions.
Talk about unnecessary risk.
Market makers profit from volatility because it increases trading volume and their revenues.
No less than dealer intervention or outright abuse, interest-free day trading undermines market equilibrium. The onus here is not on the trader, but on market makers and central bankers to make a more efficient connection between currency and how markets determine its value.
The right to pay and receive interest --- real time
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