Piaget appears to have greatly underestimated the understanding of causality in children. New evidence suggests that children as young as years old showed causal reasoning.

2years.6months

Explanation:

Piaget appears to have greatly underestimated the understanding of causality in children. New evidence suggests that children as young as 2years.6months years old showed causal reasoning that is children as young as 2years.6months years old reason through a chain of events to deduce the cause of that event.

2 and the half years.

Explanation:

So, let us fill in the gap in the question. Note that the capitalized words in the question above are the missing words in the question.

" Piaget appears to have greatly underestimated the understanding of causality in children. New evidence suggests that children as young as TWO (2) AND THE HALF years old showed causal reasoning''.

Jean Piaget was a psychologist whose main work while he was alive was mainly on the stages of cognitive development in children. Just as a reminder Jean Piaget prosed four main stages of cognitive development in Children which includes sensorimotor stage,preoperational stage, concrete operational and formal operational stage. Just like it is given in the question, During Piaget's study of cognitive development in children he underestimated the understanding of causality in children.

just don't strip down in public lol

the answer is:

c. economic output