Society

Population

There is some debate about the number of people inhabiting Tawantinsuyu at its peak, with estimates ranging from as few as 4 million people, to more than 37 million. The reason for these various estimates is that in spite of the fact that the Inca kept excellent census records using their quipu, knowledge of how to read them has been lost, and almost all of them had been destroyed by the Spaniards in the course of their conquest.

Language

Since the Inca Empire lacked a written language like English, the empire's main form of communication and recording came from quipus, ceramics and spoken Quechua, the language the Incas imposed upon the peoples within the empire. The plethora of civilizations in the Andean region provided for a general disunity that the Incas needed to subdue in order to maintain control of the empire. While Quechua had been spoken in the Andean region, like central Peru, for several years prior to the expansion of the Inca civilization, the type of Quechua the Incas imposed was an adaptation from the Kingdom of Cusco (an early form of "Southern Quechua" originally named Qhapaq Runasimi = The great language of the people) of what some historians define as "Proto-Quechua" or Cusco dialect (the original Quechua dialect).

The language imposed by the Incas further diverted from its original phonetic tone as some societies formed their own regional varieties, or slang. The diversity of Quechua at that point and even today does not come as a direct result from the Incas, who are just a part of the reason for Quechua's diversity. The civilizations within the empire that had previously spoken Quechua kept their own variety distinct from the Quechua the Incas spread. Although these dialects of Quechua have a similar linguistic structure, they differ according to the region in which they are spoken.

Although most of the societies within the empire implemented Quechua into their lives, the Incas allowed several societies to keep their old languages such as Aymara, which still remains a spoken language in contemporary Bolivia where it is the primary indigenous language and various regions of South America surrounding Bolivia. The linguistic body of the Inca Empire was thus largely varied, but it still remains quite an achievement for the Incas that went beyond their time as the Spanish continued the use of Quechua.

Religion

Incan myths were an oral tradition until early Spanish colonists recorded them; however, some scholars believe that they may have been recorded on quipus, Andean knotted string records.

The Inca believed in reincarnation. Death was a passage to the next world that was full of difficulties. The spirit of the dead (camaquen) would need to follow a long dark road and during the trip the assistance of a black dog that was able to see in the dark was required. Most Incas imagined the after world to be very similar to the Euro-American notion of heaven, with flower covered fields and snow capped mountains. It was important for the Inca to ensure they did not die as a result of burning or that the body of the deceased did not become incinerated. This is because of the underlying belief that a vital force would disappear and threaten their passage to the after world. Those who obeyed the Incan moral code—ama suwa, ama llulla, ama quella (do not steal, do not lie, do not be lazy) —"went to live in the Sun's warmth while others spent their eternal days in the cold earth"[citation needed]. The Inca also practiced cranial deformation. They achieved this by wrapping tight cloth straps around the heads of newborns in order to alter the shape of their soft skulls into a more conical form; this cranial deformation was made to distinguish social classes of the communities, with only the nobility having cranial deformation.

The Incas made human sacrifices. As many as 4,000 servants, court officials, favorites, and concubines were killed upon the death of the IncaHuayna Capac in 1527, for example. The Incas also performed child sacrifices during or after important events, such as the death of the Sapa Inca or during a famine. These sacrifices were known as capacocha.

Deities

• Viracocha (also Pachacamac) – Created all living things
• Apu Illapu – Rain God, prayed to when they need rain
• Ayar Cachi – Hot-tempered God, causes earthquakes
• Illapa – Goddess of lightning and thunder (also Yakumama water goddess)
• Inti – sun god and patron deity of the holy city of Cusco (home of the sun)
• Kuychi – Rainbow God, connected with fertility
• Mama Kilya – Wife of Inti, called Moon Mother
• Mama Occlo – Wisdom to civilize the people, taught women to weave cloth, and build houses
• Manco Cápac – known for his courage and sent to earth to become first king of the Incas, taught people how to grow plants, make weapons, work together, share resources, and worship the Gods
• Pachamama – The Goddess of earth and wife of Viracocha, people give her offerings of coca leafs and beer and pray to her for major agricultural occasions
• Qochamama – Goddess of the sea
• Sachamama – Means Mother Tree, goddess in the shape of a snake with two heads
• Yakumama – Means mother Water, represented as a snake, when she came to earth she transformed into a great river (also Illapa)

Economy

The economy of the Inca Empire has been characterized as involving a high degree of central planning. While evidence of trade between the Inca Empire and outside regions has been uncovered, there is no evidence that the Incas had a substantial internal market economy. While axe-monies were used along the northern coast, presumably by the provincial mindaláe trading class, most inhabitants of the empire would have lived in a traditional economy in which male heads of household were required to pay taxes both in kind (e.g., crops, textiles, etc.) and in the form of themit'a corvée labor and military obligations, though barter (or trueque) was also present in some areas. In return, the state provided security, food in times of hardship through the supply of emergency resources, agricultural projects (e.g. aqueducts and terraces) to increase productivity, and occasional feasts. The economy rested on the material foundations of the vertical archipelago, a system of ecological complementarity in accessing resources, and the cultural foundation of ayni, or reciprocal exchange.