U.S. President Donald Trump is going to hit Canadian goods with 25 per cent tariffs on Tuesday, with a lower 10 per cent duty for energy, according to provincial government sources.

Here香蕉视频直播檚 a look at some of the key questions as the clock ticks down.

What is a tariff?

Tariffs are a tax on imported goods. Like other taxes, they香蕉视频直播檙e generally used by government to help meet policy objectives and raise revenue.

The main goal of tariffs is usually to help boost and protect domestic producers by raising costs for importers. The trade-off is that those costs are often passed on to consumers.

Free-trade agreements generally either lower or remove tariffs between the member countries. But sometimes it doesn香蕉视频直播檛 work out that way.

What are the immediate and long-term effects of tariffs?

The impact of tariffs can vary widely depending on how high they are, how broadly they香蕉视频直播檙e applied, and how long they香蕉视频直播檙e in place.

If a tariff is high enough, it can swiftly deter imports for products in the category. For example, the 100 per cent tariffs Canada has put on electric vehicles from China seems to have stopped Tesla香蕉视频直播檚 practice of selling vehicles from the country in Canada.

Meanwhile, the 25 per cent tariff Canada imposed on Chinese steel and aluminum is projected by the Parliamentary Budget Officer to cut imports of those products from China by nearly half. The metal tariffs are expected to lead to about a billion dollars in revenue for Canada over five years.

U.S. tariffs will likely lead to a drop in Canadian goods heading there because they香蕉视频直播檒l be less competitive. Over the long term, Canadian exporters could find other markets, but the sheer size of the U.S. economy means it would be a daunting task to completely replace it.

How fast could we see prices on store shelves affected?

The effect on prices also depends on the nature of the tariffs imposed, and crucially, how much of the cost companies pass on to consumers. There will likely be a lag on price increases though as companies might initially absorb some of the added cost.

The Bank of Canada has released some potential price forecasts including a fairly severe scenario of the U.S. imposing 25 per cent tariffs on all imported goods and its trading partners responding in kind on U.S. products.

Under such conditions, the bank figures tariffs would have a minimal effect on prices in the first year. In year two, inflation rises by an extra 0.5-percentage points, while year three sees a one-percentage-point increase added from tariffs.

In the illustrative scenario, a faster pass-through on prices to consumers could see inflation jump 0.8-percentage points in the first year, while a slow passing on of costs could actually lead to a slight fall in prices.

What do tariffs mean for the economy?

The U.S. imposing tariffs could start a damaging cycle of higher costs leading to lower demand, which in turn would slow the economy and create higher unemployment, further eroding demand and economic health.

The snowballing factors would pressure the Canadian dollar and cause business investment to decline, which in turn leads to further job losses and wider drags on the economy.

Under the Bank of Canada香蕉视频直播檚 mutual 25 per cent tariff scenario, it sees Canada香蕉视频直播檚 export volumes declining sharply because of less demand from the U.S., while the global GDP slowdown would also mean lower commodity prices to further reduce demand for Canadian exports.

GDP would take a 2.4 per cent hit in year one of the tariffs under the central bank香蕉视频直播檚 main scenario, followed by a 1.5 per cent impact in year two and then no effect in year three.

What are some of the sectors that could be hardest hit by tariffs?

Export-oriented businesses will be most affected of course, but the toll will depend on how hard it would be for U.S. buyers to find alternatives, and how much buffer those buyers have to shoulder the added costs.

S&P Global said sectors that process resources would likely be most affected, so industries like paper and plastic production as well as machinery and chemical manufacturing.

Industries that often export raw commodities, such as oil and gas and mining, would be less affected because U.S. producers add value to those resources by processing them, so there香蕉视频直播檚 a wider margin to absorb the cost of tariffs.

S&P Global said paper products and printing could see between a nine and 15 per cent decline in output, while metals would see something in the range of three to six per cent.

Heavily integrated industries like the automotive sector would also be heavily disrupted because parts often cross the border several times before a vehicle is completed.