Sensorimotor stage
Tertiary circular stage is the sub stage of sensorimotor development which happens between 12-18 months of age. At this stage, the infant passes through tertiary circular reactions of innovation and curiosity. These circular reactions are the designs in which a child deliberately investigates new possibilities with the objects and frequently involve in doing new things and searching new events.
2) mixed economies
3) market
Because it is natural process
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