Apparently Incan rulers influenced every aspect of the Incan civilization. They were believed to be descendants of God and were been worshipped by the people. Their orders were carried on as customs and traditions by people.
Agriculture influenced the city of Machu Picchu a lot as evident from its geographical location. The site surrounded by a river from three sides and vast amount of plantation encouraged agriculture. Potatoes and tomatoes are the two main crops that the Spanish invaders also took along with them during their conquest of Incan empire. The main issue for people of Machu Picchu was the availability of enough land to cultivate, so to overcome the deficiency of farmland the hillsides were terraced. This also provided