remember the T’ai-chi T’u symbol. Or take a look at CB’s logo, in which the dollar sign becomes the interface between the light and dark. In securities and commodity markets, you have a cycle of bullishness and bearishness as prices rise and fall; and speculation (and activity) is notably greater at price peaks than at troughs.
This is something we have to remember when it comes to analysing the way of the dollar. Price cycles in the dollar, as the symbol may help us see, can be ana lysed exclusively in terms of the ebb and flow of sentiment among participants. But we need a system to help us gauge where we are in the cycle of hope and fear. And this system must of course draw on the data that are available for the currencies, CB has classified four gauges of sentiment. They overlap so some degree; they are arbitrary; and there is no pretence that they are exhaustive, let alone perfect. But they have served well and stood the test of several years and several multi-year cycles.
The four Sentiment Gauges
The recurrence of certain behaviour patterns at price extremes is most fortunate. We know from long experience of the financial markets what these behaviour patterns are like. So if we can gauge them, we can in theory perform a continuous diagnosis of the market, by locating its fluctuations all the way up the time scale from days through weeks and months to years. In practice we are limited by the availability of hard data: for instance some data exist on a daily basis, some only weekly, but most only irregularly.
Currency Bulletin uses four gauges of sentiment, which are designed to help identify these price extremes which are also extremes of consensus and speculation. They are:
1)
2)
3)
4)
Two of the 4 sentiment gauges – the consensus gauge and the open interest gauge – are supposed to locate extremes in consensus and speculation, hence peaks and troughs in the dollar. They are used in a contrarian manner. They are early warning indicators which tell us to cut back exposures or

eliminate them. The other two – reaction to news and perception of trend – aim to tell us when the correction or reversal has started, i.e. the moment when it is appropriate to open positions in the opposite direction.
Open Interest
Speculation and activity can be measured statistically in the IMM. For sure, the IMM accounts for a very small fraction of activity in the world’s forex* markets. Yet, as explained, it is significant out of all proportion to its relative size, because it is a distillate of
Traders, as noted, can be divided into two categories: a) those who buy on a price rise and sell on a fall (‘price-led’* traders), and b) those who sell a rise and buy a fall (‘value-led’* traders). And in fact, the party we are looking for –the party whose action marks and indeed causes the extremes

of a price trend –is not just the speculator, but the ‘price-led’ speculator who buys the rise and sells the fall. They are the initiators of positions
In real life, we find that the IMM open interest (01) tends to move faithfully in line with the perceived trend –as you can see from the charts here. It increases as the price trend progresses, and contracts whenever the trend is checked or corrected.
In the 01 figures, we are looking for an open interest rising in line with the trend to tell us when we have an increasingly overextended position. What happens when speculators think a trend has
We can see these situations easily enough in retrospect. It’s not so easy before the event. Nobody said it was easy. But when the open interest gets above certain historical levels, we have a warning light. For example we could say the lights turn yellow when the open interest in the O-Mark gets above 80,000 and red when it gets above 90,000. We have to watch the other currencies contracts too. Sometimes the Swiss franc will give a warning signal –or the pound or the Yen. And sometimes the message only comes across when you take all the four major currency contracts together. For example, when traders are playing the non-dollar currencies against each other (the cross-rates*), the open interest numbers tend to get higher: we need to make a mental adjustment for this too. For example,
when there has been heavy cross-trading in the DM, the open interest has sometimes risen to 120,000, whereas otherwise 100,000 has represented an extreme in speculative interest.
NOTE.

Occasionally, a peak in daily activity or
In the currency markets the open interest gauge is uniquely valuable, I would say –and not just because it’s equally valid at both extremes, top and bottom. The open interest is just one of the sentiment gauges we have. Its advantage is that it’s objective. But remember too that