The basis of the economy is goods & services, which depend upon people, who depend upon food & water. When food & water run out, people cannot live, & cannot make & exchange goods & services, mostly agricultural & mineral. So the basis of the economy is agricultural. & the biggest problem in agriculture today is topsoil erosion & leaching, which is happening at rates faster than topsoil replenishment. & when the topsoil & associated minerals & vitamins & nutrients are gone, we'll lose our foods, & then us. & so I have a system of jugaad? solutions in mind.

Make glass baskets with small holes at their bottom. Make glass baskets with no holes at their bottom. Then place the holed baskets over the holeless baskets. Then fill the top basket with topsoil & use it to grow crops & biomaterials (ex. bamboo firewood & guayule & cotton, etc.), while catching eroded soil & minerals & nutrients & vitamins in the bottom basket. Then pour the contents of the bottom basket over the top basket when the bottom basket is reasonably full. (& copper can be used instead of glass because it's the most stable cheap metal.) & minerals & nutrients & vitamins are only lost through the harvesting of crops & biomaterials. & they can be replenished by either mining mountains or volcanic eruptions, (the only renewable sources of fertilizer), or by recycling human & agricultural animal waste, (& these animals can only live & play in sunlit pens, & which closes the loop by making it practical to catch & store nearly 100% of their waste). (& you can use bikes & wagons to transport fertilizers.) Then make greenhouses to house rows of these baskets, & to prevent wind from blowing the soil away or from knocking over the baskets, & to prevent heavy rain from causing the baskets to overflow, & to prevent the spread of blights & weeds & pests.

This system slows down topsoil depletion enough that you can actually replenish it manually & with low tech means. This system is the basis of a ~100% circular economy. (& you can use excess volcanic fertilizer to amend exposed soil to grow larger things — such as trees & larger bamboos.)