If momentum is conserved in a collision, does this indicate conclusively that the collision is elastic?

No, it doesn't. If a collision is elastic it means energy is conserved but it does not mean all the energy is conserved. If a collision is conclusively elastic it means there's is no loss of kinetic energy in the collision. Put in a different way: the total initial Kinetic Energy in the system must equal the total Kinetic Energy after the Collision. An elastic collision only shows that the collision is free of external forces; there's always a small loss due to heat and friction.

Hahahah jsu’s hsjshshsh. shjshshshsh.

Supply is the markets term for selling a specific quantity of products at various prices. the law of supply and demand is the one which affect the pricing and also the quantity the market is able to produce or make available.