This revision short looks at some of the Micro & Macro Effects of US Tariffs on Steel & Aluminium

Microeconomic Effects

🏭 Rising Input Costs for Domestic Firms: Higher tariffs increase the price of imported steel and aluminium. US manufacturers that use these materials (e.g. car makers, construction firms) face higher marginal costs, which may reduce output and profit margins.

🛒 Higher Prices for Consumers: As firms pass on higher input costs, prices of goods using steel and aluminium (e.g. vehicles, appliances) rise. This leads to a loss of consumer surplus and reduced allocative efficiency.

⚙️ Reduced Foreign Competition (Import Substitution): Domestic steel and aluminium producers may benefit from reduced competition, allowing them to increase output. However, this can reduce productive efficiency over time if firms become complacent due to less pressure to innovate.

Macroeconomic Effects

📈 Short-Term Boost to Domestic Industry: In the short run, US steel and aluminium industries may expand, increasing investment and employment in those sectors—raising aggregate demand (AD).

🌍 Retaliation & Trade War Risk: Trading partners may retaliate with tariffs on US exports (e.g. EU on US cars or agriculture), potentially triggering a trade war. This reduces net exports (X–M) and global trade volumes, harming GDP.

📉 Inflationary Pressure: Higher input costs can lead to cost-push inflation, especially if tariffs raise prices across multiple sectors. This may reduce real incomes and dampen consumer spending.