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https://www.cato.org/blog/smoot-hawley-tariff-great-depression

“Today we know that market participants do not wait for a major law to pass, but instead try to anticipate whether or not it will pass and what its effects will be.

Consider the following sequence of events:

The Smoot-Hawley tariff passes the House on May 28, 1929. Stock prices in New York (1926=100) drop from 196 in March to 191 in June. On June 19, Republicans on the Senate Finance Committee meet to rewrite the bill. Hoping for improvement, the market rallies, but industrial production ( 1967 = 100) peaks in July, and dips very slightly through September. Stocks rise to 216 by September, hitting their peak on the third of the month. The full Senate Finance Committee goes to work on the tariff the following day, moving it to the Senate floor later in the month.

On October 21, the Senate rejects, 64 to 10, a move to limit tariff increases to agriculture. “A weakening of the Democratic-Progressive Coalition was evidenced on October 23,” notes the Commercial and Financial Chronicle. In this first test vote, 16 members of the anti-tariff coalition switch sides and vote to double the tariff on calcium carbide from Canada. Stocks collapse in the last hour of trading; the following morning is christened Black Thursday. On October 28, a delegation of senators appeals to President Hoover to help push a tariff bill through quickly (which he does on the 31st). The Chronicle headlines news about broker loans on the same day: “Recall of Foreign Money Grows Heavier-All Europe Withdrawing Capital.” The following day is stalemate. Stocks begin to rally after November 14, rising steadily from 145 in November to 171 in April. Industrial production stops falling and hovers around the December level through March.

On March 24, 1930, the Senate passes the Smoot-Hawley tariff, 222 to 153. Debate now centers on whether or not President Hoover will veto. Still, stocks drop 11 points, to 160, in May. On June 17, 1930, despite the vigorous protests of a thousand economists, Hoover signs the bill into law, noting that it fulfills a campaign promise he had made, and stocks drop to 140 in July.

The Commercial and Financial Chronicle dated June 21, 1930 led off with the major events of the week –”the signing by the President of the Smoot-Hawley tariff bill” and “a renewed violent collapse of the stock market.” Without ever quite linking the two events, the Chronicle did observe that “if the foreigner cannot sell his goods to us he cannot obtain the wherewithal to buy our goods.” Other sections noted that international stocks were particularly hard hit, that 35 nations had vigorously protested the tariff and threatened retaliation, and that Canada and other nations had already hiked their own tariffs “in view of the likelihood of such legislation in the United States.”

It may be hard to realize how international trade could have so much impact on the domestic economy. For years, in explaining income movements in the Thirties, attention has instead been focused on federal spending and deficits. Yet on the face of it, trade was far more important: exports fell from $7 billion in 1929 to $2.5 billion in 1932; federal spending was only $2.6 billion in 1929 and $3.2 billion in 1932. In 1929, exports accounted for nearly seven percent of our national production, and a much larger share of the production of goods (as opposed to services). Trade also accounted for 15 to 17 percent of farm income in 1926-29, and farm exports were slashed to a third of their 1929 level by 1933.

Even these numbers, however, understate the significance of trade. Critical portions of the U.S. production process can be crippled by a high tax on imported materials. Other key industries are heavily dependent on exports. Disruptions in trade patterns then ripple throughout the economy. A tariff on linseed oil hurt the U.S. paint industry, a tariff on tungsten hurt steel, a tariff on casein hurt paper, a tariff on mica hurt electrical equipment, and so on. Over eight hundred things used in making automobiles were taxed by Smoot-Hawley. There were five hundred U.S. plants employing sixty thousand people to make cheap clothing out of imported wool rags; the tariff on wool rags rose by 140 per cent.

Foreign countries were flattened by higher U.S. tariffs on things like olive oil (Italy), sugar and cigars (Cuba), silk (Japan), wheat and butter (Canada). The impoverishment of foreign producers reduced their purchases of, say, U.S. cotton, thus bankrupting both farmers and the farmers’ banks.

It should be obvious that an effective limit on imports also reduces exports. Without the dollars obtained by selling here, foreign countries could not afford to buy our goods (or to repay their debts). From 1929 to 1932, U.S. imports from Germany fell by $181 million; U.S. exports to Germany fell by $277 million. Americans also had little use for foreign currency, since foreign goods were subject to prohibitive tariffs, so the dollar was artificially costly in terms of other currencies. That too depressed our exports, which turned out to be particularly devastating to farmers-the group that was supposed to benefit from the tariffs.

There had already been some damage done (particularly to farm exports) by the tariff legislation of 1921 and 1922. “