An owner of a small candy shop in feathered hair extensions

As many Syrians, poor and rich, feel the effects of the revolt in feathered hair extensions their daily lives, a sense of desperation is echoed in the streets, even in Damascus and Aleppo, the country’s two largest cities and economic centers.

Analysts also point out that Syria could use sanctions to rally its people against a common threat.

While neither has risen up like other Syrian cities, complaints are growing, and American and Turkish officials say they believe that the merchant elite in both cities will eventually turn against Mr. Assad.

“I can no longer afford to buy anything for my family,” said Ibrahim Nimr, an economic analyst based in Damascus, the capital. “I am not making any more money. I am facing difficulties, and I don’t know what to do.”

A businessman in Damascus, who spoke on the condition of anonymity for fear of reprisal, said: “People are not buying anything they don’t need these days. Just barely the necessities.”

American and Turkish officials say that a collapse is not imminent and that the government can wholesale feather earrings probably survive through the end of the year. But they now believe it is possible that the toll of the sanctions and protests could bring down Mr. Assad in 6 to 18 months.

“We’re all waiting for the thing that will crack them,” an Obama administration official said, speaking on the condition of anonymity. “And it will be the economy that will wake everybody up, both those who support him, and Assad and his circle.”

Revenues from oil and gas exports, which account for up to a third of state revenues and are the single biggest source of foreign currency, will dry up at the beginning of November, when a European Union ban on imports will fully come into force.

The unrest has paralyzed the tourism industry, which brings in $7.7 billion a year. Several hotels in Damascus said they did not have any bookings for now or anytime in the future, and some hotel owners said that they closed down in the summer because they could no longer afford to pay salaries and bills.

An owner of a small candy shop in Souk al-Hamidiyeh, an old market in the heart of Damascus, said that he had not seen a single tourist since March, when the uprising against Mr. Assad began.

“And it doesn’t look like we will see tourists anytime soon,” the owner added.

Dik al-Jin, one of the oldest restaurants and the most popular site for weddings and parties in Homs, a city in central Syria where the uprising has the semblance of a civil war, also shut down because of a lack of customers, soon after the demonstrations broke out.

But uncertainties persist over the international strategy to put pressure on the Syrian economy. American and European officials have debated whether the sanctions will end up hurting average Syrians more than the leadership. Some analysts have contended that the government may try to paint itself as a victim and court support by casting the sanctions as a contest of “us against them.”

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