What type of primary was ruled unconstitutional in 2000?

That could be a lot , the primary was ruled for lots of different reasons

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.

Complementary goods. they go together, thats why one price increase and the others demand increases