What were the institutions which caused accumulation of wealth in Sone Ki Chidiya Era?

As we understand in agrarian system of economy (Honey Bee Colony)

The responsible individual components of agrarian system are the institutions which caused accumulation of wealth.

The first component was small family of offspring’s who were responsible to carry forward the legacy from their ancestors in the form of proprietary technical knowhow and its practice in daily life.

The second component was the bigger family of interdependence in the form of self dependent village where every small family was experts of one specific art or trade valuable for the village family. (Kalaripayattu, to making of Wootz steel, shoe etc.)

Third component was the regional family of annual temple fares where they gather to show individual strengths of skills to become meritorious couples. (Swayamvar)
Keep skill-sets updated, sharpened.(you may find when Alexander came with a professional army which consistently prolonged period of time doing only one activity that is war, will definitely become more expert in war skills than any rival who never got opportunity of fighting always new enemies continuously.

Here the army of Porus never fought in life time with any new enemy; So theoretically have zero experience of war.

But this component of regular annual faire at temple place to show the skills given the opportunity of ordinary folk to practice consistently and shine in the gathering to make goodwill of family of first, second, and third order.

Because of this institute the invincible army of global fighters turned back losing there favourite king in the way backward.

Fourth component was the wider family of nationhood where consistent evolution in technologies take place and dissipate through the Kumbh held regularly every three year in some part of country to show the advancement, discussion and adoption of new thoughts, technologies, and arts.

Because of this institute India was able to comprehend Yog, Aayurved, Astronomy, Surgery, Metallurgy, Gemmology, Mathematics, Linguistics, Philosophy and Chemistry.