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.
What is ketchup made of? To break it down in simplest terms, itâs made of tomato sauce, vinegar, sugar, and spices. The recipe Iâm sharing today is a basic one that can easily be tweaked and made your own. With this base, you can make different flavors of ketchup, such as balsamic, Sriracha or roasted garlic.