United States involvement in the Mexican Revolution with its diplomatic and economic rivals in Mexico, particularly Great Britain and Germany, meant that foreign powers affected the way the Mexican situation played out. When U.S. agents discovered that the German merchant ship, the "Ypiranga", was carrying arms to Huerta's regime, President Wilson ordered troops to the port of Veracruz to stop the ship from docking. The U.S. did not declare war on Mexico city but the U.S. troops carried out a skirmish against Huerta's forces in Veracruz. The "Ypiranga" managed to dock at another port, which infuriated Wilson. On April 9, 1914, Mexican officials in the port of
Marginal propensity to import ratio of the change in imports to the change in income, thus giving us a figure between 0 and 1. Imports are also considered to be automatic stabilisers that work to lessen fluctuations in real GDP. The UK government assumes that UK citizens have a high marginal propensity to import and thus will use a decrease in disposable income as a tool to control the current account on the balance of payments. Marginal propensity to import The marginal propensity to import (MPI) is the fractional change in import expenditure that occurs with a change in disposable income (income after taxes