The way China's currency moves against the dollar could be the best measure of how well U.S.-Chinese trade talks are proceeding.

Strategists say the fact the renminbi, also known as the yuan, has steadied against the dollar and is edging higher is one of a number of positive signs that show the Chinese are serious about the trade talks.

(The currency is typically quoted in dollar/yuan terms which means on the chart above the yuan is strengthening when the line is falling.)

The currency has been a point of contention between China and the Trump administration, which has said in the past it was intentionally weakened to help Chinese exports.

"People think it's being politicized to help facilitate better trade talks. When the dollar was bid, the RMB did not weaken that much, and today the dollar is softer, the RMB is not strengthening that much. The idea is officials are trying to dampen volatility to help facilitate the trade discussions," said Marc Chandler, chief market strategist at Bannockburn Global Forex.

Chandler said the renminbi, also known as the yuan, appeared to become steadier against the dollar, just ahead of the dinner meeting between President Donald Trump and China President Xi Jinping in Buenos Aires Dec. 1. The two leaders agreed to a trade truce and agreed to hold off on further tariffs, while they negotiate for a 90-day period. China also agreed to drop new tariffs on U.S. autos and buy U.S. soy beans.

"I think the negotiation is a real negotiation now. It seems like China is trying to deliver something to the negotiating table that's going to keep the momentum going. They're trying to deliver something on the currency," said Jens Nordvig, CEO of Exante Data.

China's central bank sets a daily exchange rate for the yuan based on recent prices, and allows trading against the dollar in a band that could be as much as 2 percent above or below that level. The currency began to move noticeably lower against the dollar as trade tensions rose in the second quarter, but recently China has been deliberate in keeping it from falling.

"It suggests very strongly they do not want to have the currency weaker, and they want to give it a strengthening bias. That's something that is part of the negotiations, and I think it was discussed at the dinner," said Nordvig. "At a minimum, we will get stability and quite likely some recovery from the Chinese perspective...That could start to feed into the dollar on a broad basis. It has not done so yet. If these negotiations, in a more convincing way, show progress, I think that's more likely."

The dollar/yuan pair has moved higher, meaning the dollar gained against the yuan, most noticeably since June when the market began pricing in trade tensions. So far this year, the dollar is up 6 percent, and it could reverse that move.

"I feel strongly this negotiations has momentum for now. If the negotiation turns out to be successful that takes the tariff premium out of the dollar. If you have a successful negotiation, it will come out," said Nordvig. "For the Chinese currency, it's something in the region of 6 to 8 percent. If you translate it on a global basis, it's going to be less meaningful than for China and countries that are linked to China."

Nordvig said the dollar should continue to slide as talks go on, as long as they are positive. "The central case is we will see progress, and if we get to the finish line is yet to be seen," Nordvig said. "The negative aspect is we don't have strong global growth. We really need to have the relief from this. Otherwise, we're going to sit on a spot where the economy doesn't have much momentum"

Wall Street Journal reports that China is discussing revising aspects of its "Made in China 2025" to dominate emerging technologies and open its markets more to foreign companies show another big sign of China's commitment to the talks, said Nordvig. He said its economy is already showing signs of strain from the 10 percent U.S. tariffs, evident in trade data, and an increase to 25 percent on $200 billion in goods would be even more harmful.

For the U.S., strategists said trade concerns could hit the economy through delayed business spending, as companies wait to see the outcome of talks. Tariffs could also show up as higher prices for consumers on some goods.

Chandler said it is unclear whether the talks will lead to a deal, but for now they look promising.

"A pretty bad sign would be if we saw the RMB weakening when it ought not to be," said Chandler. "We won't know that for awhile."

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