In the formal language of economics, X and Y are substitutes if the demand for X increases when the price of Y increases, or a positive cross elasticity of demand.
Potting mix is the material that goes into a garden pot before you put seeds and plants into it. 1  It keeps the plant in place. 2  It holds water for the plantâs roots to soak up.  It contains nutrients that feed the plant.
Sportin' Waves. 1  Petrolatum: Occlusive hair conditioning agent made from a semisolid mixture of hydrocarbons obtained from petroleum. 2  Water: Nothin' wrong with that. 3  Glycerin: Vegetable-based humectant; absorbs and retains moisture.