What is the economic theory given for the fall of the indus valley civilization? lack of resources devaluation of money falling behind technologically decline in trade

A decline in trade would be the answer.

The Indus Valley Civilization started to weaken around 1800 BCE. Archaeological evidence specifies that trade with Mesopotamia, situated mainly in modern Iraq, and appeared to have finished. The progressive drainage systems and baths of the abundant cities were constructed over or congested. Inscription started to vanish, and the consistent masses and measures used for trade and levies fell out of use.

a   church leadership can be defined as a process of influencing other people to work together to accomplish a desired purpose.

in this case one person acting as a role model and influencing other to work as one person to accomplish a certain misson or purpose.

this can be either leading people to do the work of god

"they had a large area of land that they owned."