This tabular version of demand reflects the relationship between the price of x and the quantity that our mythical consumer would be willing and able to purchase at each of these prices. Note that we say willing and able, because willingness alone is not effective in the market. I may be willing a Mercedes, but if this willingness is not backed by the ability to buy that is, by the necessary dollars, it will not be effective and, therefore, not reflected in the market. In table 3.2, if the price of x in the market happened to be $5 per unit, our consumer would be willing and able to buy 10 units per week, if it were $4; the consumer would be willing and able to buy 20 units per week and so on.