thE First two sEntEnCEs in thE sEConD pArAgrAph tEll us thAt ______.
A．proDuCErs CAn sAtisFy thE ConsumErs By mEChAnizED proDuCtion
B．ConsumErs CAn ExprEss thEir DEmAnDs through proDuCErs
C．proDuCErs DECiDE thE priCE oF proDuCts
D．supply AnD DEmAnD rEgulAtE priCE