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Market Reactions to Reports

To determine whether there is ample opportunity to profit from the price move that follows an event, it is necessary to study the direction of the market move and the subsequent price changes that occur over the next few days. These lagged reactions are the results of market inefficiencies; it is unlikely that prices could immediately jump to the exact price that economic principles require, despite the Efficient Market Hypothesis. With large price shocks there is often an over- or underreaction that is corrected during the next few days. Sometimes prices jump one direction and immediately begin to go the other way until they have completely discounted the price shock.
Where there is an underreaction the prices move higher over the next few days; when there is an overreaction prices move lower. To decide whether a market is a candidate for event trading, you must study the pattern of moves following the reaction to news and decide whether:
1. The size of the average move is enough to generate a profit.
2. The returns are worth the risk of loss associated with these volatile events.
When studying these events, there may be a direct relationship between the size of the reaction and the type of pattern that follows. For example, a small reaction to news may be followed by a steady continuation of the direction of the price shock. If unemployment jumps by !/4% in a month, there should be a reaction by the government to stimulate job growth. The same initial reaction would occur if unemployment jumped by 1 full percent, but the number would be so unexpectedly large that it may be considered an error in which case it is not clear to what extent the government would respond. The market may overreact to a large shock but underreact to a small one. The only way to discover this is by testing these events.
Fundamental to understanding price shocks is that the shock is based on the difference between the expectations and the actual reported data, not just the reported dataThe market always discounts what it believes is its best guess at what the report will say., therefore, if bond prices rise in advance of an important unemployment report, we can say that the market expects unemployment to increase. If bond prices have moved up by 1/2% (equivalent yield) in expectation of a very bad report, and the report comes out neutral, then prices will drop sharply to offset the incorrect anticipation. When studying market reactions from historic records of economic data, you must have market expectations to find consistent results; without those values, the best approach is to work backward from the reaction to infer the accuracy of expectations.

EVENT TRADING

The largest price moves and the greatest volatility are the result of reactions to unexpected news. These market events pose the greatest risks to all traders because they are unpredictable and of such great magnitude that they are out of proportion with normal trading risk. It may be possible to trade for a number of years without experiencing an adverse price shock., therefore, many traders do not plan properly for these situations.
Not all price shocks are of such magnitude that they present an unmanageable problem. it may be that price moves are either the reaction to news or the anticipation of news. This news is most often a release of an economic report by a government agency or monetary authority, but can also be a natural disaster associated with weather or earthquakes, or a political event, such as an outbreak of war, a military coup, or an assassination. The U.S. government releases economic data on an announced schedule, many of them at 7:30 A.M. Chicago time, that create regular disruptions to price movements in world economic markets.
The frequency and size of these price moves, triggered by unexpected news, makes these events a natural candidate for a trading system.’ The profit opportunity, however, does not lie in taking a position ahead of the anticipated market reaction, but in studying the systematic patterns that come after the initial price reaction to the news. Because the news is unexpected, you cannot predict the results nor the extent of the reaction; therefore, taking a market position in advance of a government report would have a 50% chance of success and often very high risk. Studies might show that there is a bias in the direction of the price shock due to the way the monetary authority plans economic growth and controls inflation; however, the risks would remain high.

Market Selectivity

The market seems to focus on one news item at a time. Although the same factors are always there to affect prices, they must reach a point of newsworthiness before they become the primary driving force. For heating oil, the combination of unexpected, sustained cold weather compared with available inventories will activate a weather market. Interest rates, the U.S. dollar, and tension in the Middle East will either be magnified out of proportion or completely ignored, while the anticipation of demand rises sharply. A market analysis of shortages not supported by news may as well be discarded-it is more often that crowd behavior moves the market.