“The political message is greater than the economic hit,” said Chiao Chun, a former trade negotiator for the Taiwanese government.

Even though about 90 percent of Taiwan’s imported gravel and sand comes from China, most of that is manufactured. China accounted for only about 11 percent of Taiwan’s natural sand imports in the first half of this year, according to the Bureau of Mines.

The two types of Taiwanese fish exports that China restricted last week — chilled white striped hairtail and frozen horse mackerel — are collectively worth about $22 million, less than half the value of the Taiwanese grouper trade that was banned earlier this year. They are also less dependent on the Chinese market.

As for Taiwan’s half-a-billion-dollar citrus industry, its shipments to China account for only 1.1 percent of the island’s total agricultural exports, according to Taiwan’s Agriculture Council. A popular theory is that Beijing singled out citrus farmers because most orchards are in southern Taiwan, a stronghold for the governing political party, the Democratic Progressive Party, a longtime target of Beijing’s anger.

Future bans may become more targeted to punish industries in counties that are D.P.P. strongholds, said Thomas J. Shattuck, an expert on Taiwan at the University of Pennsylvania’s Perry World House. There may also be less retaliation against counties run by the Kuomintang opposition party “in an attempt to put a finger on the scale for Taiwan’s local, and even national, elections,” he added.

increasingly indispensable node in the global supply chains for smartphones, cars and other keystones of modern life. One producer, the Taiwan Semiconductor Manufacturing Company, makes roughly 90 percent of the world’s most advanced semiconductors, and sells them to both China and the West.

simulated a blockade of Taiwan.

Even though some of the exercises took place in the Taiwan Strait, a key artery for international shipping, they did not disrupt access to ports in Taiwan or southern China, said Tan Hua Joo, an analyst at Linerlytica, a company in Singapore that tracks data on the container shipping industry. He added that port congestion would build only if the strait was completely blocked, port access was restricted or port operations were hampered by a labor or equipment shortage.

“None of these are happening at the moment,” he said.

Vessels that chose to avoid the Taiwan Strait last week because of the Chinese military’s “chest beating” activities would have faced a 12- to 18-hour delay, an inconvenience that would generally be considered manageable, said Niels Rasmussen, the chief shipping analyst at Bimco, an international shipping association.

If Beijing were to escalate tensions in the future, it would indicate that it was willing to put at risk China’s own economy as well as its trade and relations with Japan, South Korea, Europe and the United States, Mr. Rasmussen said by phone from his office near Copenhagen.

“That’s just difficult to accept that they would take that decision,” he added. “But then again, I didn’t expect Russia to invade Ukraine.”

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