<P> From 1438 to 1533, the Incas incorporated a large portion of western South America, centered on the Andean Mountains, using conquest and peaceful assimilation, among other methods . At its largest, the empire joined Peru, large parts of modern Ecuador, western and south central Bolivia, northwest Argentina, north and central Chile and a small part of southwest Colombia into a state comparable to the historical empires of Eurasia . Its official language was Quechua . Many local forms of worship persisted in the empire, most of them concerning local sacred Huacas, but the Inca leadership encouraged the worship of Inti--their sun god--and imposed its sovereignty above other cults such as that of Pachamama . The Incas considered their king, the Sapa Inca, to be the "son of the sun ." </P> <P> The Inca Empire was unique in that it lacked many features associated with civilization in the Old World . In the words of one scholar, "The Incas lacked the use of wheeled vehicles . They lacked animals to ride and draft animals that could pull wagons and plows...(They) lacked the knowledge of iron and steel...Above all, they lacked a system of writing...Despite these supposed handicaps, the Incas were still able to construct one of the greatest imperial states in human history". Notable features of the Inca Empire include its monumental architecture, especially stonework, extensive road network reaching all corners of the empire, finely - woven textiles, use of knotted strings (quipu) for record keeping and communication, agricultural innovations in a difficult environment, and the organization and management fostered or imposed on its people and their labor . </P> <P> The Incan economy has been described in contradictory ways by scholars: as "feudal, slave, socialist (here one may choose between socialist paradise or socialist tyranny)". The Inca empire functioned largely without money and without markets . Instead, exchange of goods and services was based on reciprocity between individuals and among individuals, groups, and Inca rulers . "Taxes" consisted of a labor obligation of a person to the Empire . The Inca rulers (who theoretically owned all the means of production) reciprocated by granting access to land and goods and providing food and drink in celebratory feasts for their subjects . </P> <P> The Inca referred to their empire as Tawantinsuyu, "the four suyu". In Quechua, tawa is four and - ntin is a suffix naming a group, so that a tawantin is a quartet, a group of four things taken together, in this case representing the four suyu ("regions" or "provinces") whose corners met at the capital . The four suyu were: Chinchaysuyu (north), Antisuyu (east; the Amazon jungle), Qullasuyu (south) and Kuntisuyu (west). The name Tawantinsuyu was, therefore, a descriptive term indicating a union of provinces . The Spanish transliterated the name as Tahuatinsuyo or Tahuatinsuyu . </P>

Who controlled the economy of the incan empire