Investors are bracing for tomorrow's release of revised US gross domestic product figures for the second quarter, the most important statistical event of the week for equity investors.
Most analysts expect the report to show that the economy expanded at a much faster rate between April and June than was first estimated.
If so, the release will re-energise the debate about how much longer key US interest rates can be held steady at 5.5 per cent.
By extension, it will also re-focus attention on whether investors can expect the bull run on Wall Street to continue.
The discussion - which at its basest level pits the so-called new paradigm economists against old-school, boom-and-busters - has returned to the foreground with a vengeance this month.
Unease about the direction of interest rates has contributed to the startling volatility in US equity markets.
In each of the 14 trading sessions to Monday, the Dow Jones Industrial Average has seen movements of at least 100 points.
