||the grid of cells representing a digitized terrain
||the digital human being, has attributes like vision, metabolism, sex etc.
||abbr. CU, refers to the number of cycles, for which a current commodity's stock will suffice. Derived by dividing commodity by metabolism for that commodity.
|marginal rate of substitution
||abbr. MRS, the value of sugar in units of spice.
||the excess supply of one commodity after subtracting the amount required to keep TUD constant.
|time until death
||abbr. TUD, the number of cycles that a citizen will survive given present stock levels. It is equal to the lowest value of all CU's.