A consumer’s preferences are said to monotonic if and only if between any two bundles, the consumer prefers the bundle which has more of at least one of the goods and no less of the other good as compared to the other bundle.
For instance, the consumer between any bundles say (x1, x2) and (y1, y2), if (x1, x2) has more of at least one of the goods and no less of the other good compared to (y1, y2) then the consumer prefers (x1, x2) to (y1, y2). This is called monotonic preferences. Here, the consumer will not remain indifferent between two combinations of commodities when he has an opportunity to have more quantity in one combination than the other.
