"Investors are not panicking as people believe that they have to reach agreement before the deadline - it is just a case of how close they are going to let it run before they do," Williamson said.
The US dollar fell to a three-month low yesterday as investors contemplated the prospect of a US debt default if no progress is made.
NZOG eased 3c to 67c after the company cut its estimate of reserves at the Tui oilfield in Taranaki.
APN News eased 5c, or 3.33 per cent, to $1.45 on small volume.
Scott Technology rose 5c to $1.45, also on light volume.
Among leading stocks, Telecom rose 2.5c to $2.65, and Fletcher Building rose 2c to $8.25, while Contact Energy was unchanged at $5.15.
Mainfreight rose 7c to $10.15 and Freightways rose 2c to $3.42. Air NZ rose a cent to $1.18 and Kathmandu rose 4c to $2.19.
OceanaGold lost 4c to $3.56.
In the United States, declining issues solidly outpaced advancing ones, even though major averages showed mostly modest declines.
A failure to raise the US debt limit by an August 2 deadline could unsettle markets and hurt the economy if the US puts off paying bills.
"Investors believe that there's going to be a resolution at the 11th hour, but many of those investors are starting to get cold feet," said Hugh Johnson, chief investment officer of Hugh Johnson Advisors in New York.
Just 6.53 billion shares changed hands on the New York Stock Exchange, NYSE Amex and Nasdaq, below the daily average of 7.49billion.
At the close, the Dow Jones industrial average was down 0.7 per cent at 12,501.30, the Standard & Poor's 500 Index was down 0.4 per cent at 1331.94, and the Nasdaq Composite Index was down 0.1 per cent at 2839.96.
- NZPA