If markets' performance represented a relief rally, the consequences of the US not agreeing a budget deficit don't bear thinking about.
Shares fell in New York, after declines in Paris and Frankfurt, although London stocks showed a marginal increase.
The dollar tanked, tumbling more than 1% to its lowest since February, amid concerns over just how much economic damage has been done in the US by more than two weeks of government shutdown, and associated uncertainty.
Poorly-received results from eBay, IBM and Goldman Sachs did little to help.
Still, grains and oilseeds, at least, did their bit to underline Societe Generale's point that the shutdown has hurt commodities less badly than shares, continuing indeed a historical trend.
The main spark was the idea that, with the US Department of Agriculture now returned to work, data on US export sales over the last two weeks will be imminent, and expected to come in large.
"The market believes export sales since October 1 for soybeans are over 3.0m tonnes, corn sales from 1.0m-1.5m tonnes, and soymeal export sales near 800,000 tonnes," Benson Quinn Commodities said.
"The expectation for announcement of large exports is offering support."
At Country Futures, Darrell Holaday said: "The soybean expectations are at least 3m tonnes. The wheat expectation is 1.2m-1.5m tonnes."
'Really not supportive'
Much of this is believed to have been snapped up by China, of course.
"Rumours during the shutdown have China buying 1m tonnes of corn, 2.5m tonnes of soybeans, and 700,000 tonnes of soymeal," US Commodities said.
But has it really occurred? And what level really would be enough to justify the market strength seen in early deals.
Sure, Shanghai JC Intelligence said that China had bought some 20 corn cargoes from the US, equivalent to up to 1.2m tonnes. But is this enough?
"That is really not a supportive figure" on its own, Mr Holaday said, adding that for corn, expectations for US export sales overall "are more like 2.0m-2.5m tonnes.
'Running the combines hard'
There were some other reasons too for investors not to get too carried away in raising prices.
"US weather should have farmers back in the fields in many areas today and most back out running the combines hard by tomorrow," Benson Quinn Commodities said, adding that forecasts are "favourable" for the next two weeks too.
In South America "forecasts for South America are favourable for soybean planting in Brazil with scattered rains over next two weeks supportive of germination."
While Argentina is dry in the two-week outlook "the extended forecast is wetter".
And of course, yields are still coming off strong too, as Syngenta underlined, revealing a $170m writedown thanks to having too much of the grain.
Still, the downside on corn is limited by the increasing competitiveness of the US export offer, which is only being enhanced by the weakness of the dollar.
"The Ukrainian corn is now narrowed to a $0.30-cents-a-bushel discount to the US," US Commodities said.
"The February slot is down to $0.10-a-bushel premium. This will help limited the downside in the market."
Corn for December closed down 0.2% at $4.43 a bushel.
For soybeans, there was also a strong soymeal market to factor in, evident in the close of Chicago's December meal contract up 2.3% at $413.00 a short ton.
"Export meal premiums have continued to be strong. Record high levels globally are being seen with the US supply being the most competitive," CHS Hedging said.
The broker added that, in soybeans themselves, "farmer selling has been light and with the government reopened a large export number could cause a rally in cash price".
Soybean futures for November ended 1.3% higher at $12.93 ¼ a bushel, retaking the contract's 10-day, 75-day and 100-day moving averages.
That was enough to eclipse wheat, which ended well below its intraday high of $6.93 ¼ a bushel despite a late surprise from the Argentine farm ministry which, in its first production forecast for the season, pegged the domestic harvest of the grain at 8.8m tonnes.
While forecasts for Argentine wheat output have been declining, thanks to concerns over weather damage, the 9.5m tonnes set by the United Nations Food and Agriculture Organization had been something of a low water mark.
And while Canada's wheat harvest may be a record one, exports will not, official estimates showed, amid market concerns over logistical bottlenecks.
Wheat for December closed up 0.7% at $6.86 a bushel in Chicago.
In Paris, November wheat gained 0.6% to E199.50 a tonne despite the headwinds of a stronger euro and a modest EU weekly export sales figure for soft wheat, of 269,000 tonnes.
London wheat for November eased 0.1% to £162.95 a tonne.
Among soft commodities, cotton rose too, up 0.9% at 83.91 cents a pound in New York for December delivery.
As Luke Mathews at Commonwealth Bank of Australia said earlier, "a resolution to the US debt crisis today should support investor appetite for risk assets, something that generally supports prices in the discretionary cotton complex".
And cocoa for December gained 0.7% to $2,767 a tonne in New York, a two-year closing high, underpinned by some firm data on Asia's cocoa grind in the July-to-September quarter.
However, arabica coffee for December dropped 1.0% to 114.70 cents a pound in New York, weighed down by continued talk of large supplies.
Societe Generale placed coffee on the bank's list of top underweight, short-term bets, saying that "prices continue to struggle amid a global surplus, while recovering Central American production should help reverse even the modest rebound seen over the past few weeks.
"There are indications of better grinder demand, but arabica prices are likely to remain flat or down near term."