Starting in 1939, any nation fighting in world war ii could purchase goods and arms in the united states under the program.

   Cash and Carry

Explanation:  Cash and carry is a policy that the US President Roosevelt officially requested at the Congress session on September 21, 1939 after the start of the war in Europe, that is, the German invasion of Poland. This led to the revision of the Neutrality Act, and enabled the sale of weapons and goods to allies while securing the transportation of these weapons and goods by Allied ships and paying in cash. America did not bear the risk of possible losses and damages during transportation.

The Lend-Lease Act was a program by which the United States Government helped and provided allies with the supply of weapons, military vehicles, warships, planes, oil, food, aid, etc. The program was signed by US President Roosevelt on March 11, 1941, and thus before the US's official entry into WWII, became an indirect participant in the war.

a: social security and social programs

levels of production can be increased by technology while holding labor and capital constant, because increased technology makes the production process more efficient. subsequently, the lras curve is almost a vertical line, that can shift to the right, with an increase in technology.

the relationship between the lras curve and the ppc is that both can make the economy could grow. the ppc achieves that when it shifts outward because of more resources or technological advances while the lras curve shifts if more resources are developed or if there are technological advances.

the lras curve is a vertical line at an output level that represents the number of goods and services a nation can produce over a sustained period using all of its productive resources as efficiently as possible with all of the current technology available to it.

the production possibilities frontier (ppf) is a graphical device that is used for economic analysis of production decisions because the ppf measures the maximum possible combinations of two goods that an economy is capable of producing with its currently available resources and technology.