If demand for a product is increasing, an import tariff is less restrictive than an import quota.

If demand for a product is increasing, an import quota would limit the amount of the product that can be imported, potentially causing shortages and higher prices. An import tariff, on the other hand, would allow for more imports but would increase the cost of importing the product, which could lead to higher prices for consumers. Therefore, an import tariff is less restrictive than an import quota in this scenario.