Intradaily Exchange Rate Movements

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Under the theory of Purchasing Power Parity, the change in the exchange rate between two countries' currencies is determined by the change in their relative price levels locally that are affected by inflation. It is generally agreed that this theory mostly holds true over the long run, but economists have found that it can suffer distortions over the short term because of trade and investment barriers, local taxation, and other factors. As a result of this relationship, one can expect the currencies of countries with higher inflation rates to weaken over time versus their peers, whereas currencies of countries with lower inflation rates tend to strengthen.

In economies with weak production of local goods and services, the depreciation of the local currency can at times even be accelerated by the "pass-through effect" of importing foreign goods with relatively higher prices. Inflation is normally measured by governments using groups of price levels for goods in varying sectors known as price indices. These include measures such as a producer price index PPI , which measures wholesale inflation, and a consumer price index CPI , which measures inflation for consumers.

Governments and central banks frequently use these indices to help determine their economic measures through instruments such as inflation-targeting strategies. Inflation in the economies of currencies being traded is an important factor to consider because it affects the relative value of those currencies internationally and because it can determine future policy adjustments by governments and central banks. Through use of monetary policy, national central banks attempt to adjust their base interest rates and available banking money reserves to control the rate of lending by banks within their economies.

The theory is that when there is more, or cheaper, money perceived to be available in the economy through bank loans and other types of credit, consumers and businesses will spend more, sellers of goods and services will adjust prices upward, and inflation can accelerate. Conversely, when there is less, or more expensive, money available, consumers and businesses will restrict their spending, prices will fall, and inflation will decelerate.

Thus, if central banks want to curb inflation, they will raise interest rates; and if they want to induce spending and economic activity, they will lower interest rates. There are peaks in volatility at the times of the day when most Australian and US economic data are released.

There is a distinct spike in volatility at the time of the London fix. The fix is where banks establish a daily exchange rate for those customers who do not want to make an active choice as to what time of day is best to buy and sell foreign currency. Non-financial corporations and fund managers often undertake their trades at the fixing rate, and it is often used in contracts that involve foreign exchange transactions or calculations.

Customers intending to trade at the fixing rate must make this intention to trade known to their bank beforehand. The bank then buys or sells foreign exchange to cover these orders, using its discretion as to when to undertake these trades.

Key Currencies

Intra-Daily Exchange Rate Movements presents an extensive study of the Olsen & Associates database and is one of the first monographs in this exciting new. Intraday movements in the yen/dollar rate are examined over the period Large jumps in the exchange rate also are examined, and some evidence on.

As the fix is usually associated with heavy trading, market participants seeking to undertake large trades will often do so at this time. This can result in exchange rate volatility around the time of the fix. Sydney also has a fix at 9. Spikes in volatility are also observed around the opening and closing of major markets.

Volatility can arise when traders in a given foreign exchange market close out their positions at the end of the trading day. That is, traders buy or sell currencies in order to reduce their foreign currency exposure until they return to work the following day. Similarly, as traders in a given market return to work and re-establish foreign currency positions, volatility tends to rise. This is due to the fact that the analysis averages the level of volatility across all days in the sample.

In Bulletin December 2007

Since interest rate announcements occur relatively infrequently, the averaging process disguises their impact. Comparing days when interest rate announcements occur to all other days shows that announcements do have an effect on exchange rate volatility. Volatility is generally at its lowest during Sydney lunch time and Asian market lunch time. It is noteworthy that the average level of volatility was highest in the — sub-sample across almost all of the minute periods of the day. This likely reflects several periods of market uncertainty within this sub-sample, including the Asian financial crisis, Russian default crisis, the collapse of the hedge fund Long Term Capital Management and the technology stock boom and bust.

Average intraday volatility of the Australian dollar exchange rate against the euro, Japanese yen and New Zealand dollar is shown in Graph 3.

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Spikes in volatility are also observed at the times of both Australian and US economic data releases and the London fix. This may be partly attributable to stable market expectations of Japanese official interest rates over much of this period. Volatility is also highest during the overlap of London and New York trading. Similar to the Australian dollar cross rates, the exchange rates against the US dollar generally show higher volatility in the — sub-sample see Graphs 8— Intraday foreign exchange turnover reflects factors such as the flow of news and customer orders.

Analysis of intraday turnover in the foreign exchange spot market reveals similar patterns to intraday volatility across a range of currency pairs. That is, higher turnover tends to be correlated with higher volatility over the day. Hourly turnover data were obtained from Reuters over a three-and-a-half-month period, and measure the number of trades that occurred globally in the spot market through electronic broking systems.

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Purchasing Power Parity Theory

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Introduction

The profile of turnover across the day is similar to the intraday patterns in volatility Graphs 13— Download KB. Any opinions, news, research, analyses, prices, other information, or links to third-party sites are provided as general market commentary and do not constitute investment advice. Given that well over one year has elapsed since the decision, the year on year percentage change in the index value will begin to adopt a new threshold of base rate. A clear spike coincides with this time because expectation-based mechanisms manipulated the clearing rate of the two pairs of currencies.

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