One question that continually comes up when I do interviews is this: If governments are not financially constrained in their spending why do they issue debt? Usually, the question is expressed in an incredulous tone, meaning that the person asking the question considers this to be the gotcha moment, when they pierce the impeccable logic of Modern Monetary Theory (MMT) and show it for what it is – a sham. One problem is that there is a tendency to confuse motivation with function and many people sympathetic to MMT reduce it to simple statements that belie the reality. One such statement, relevant to this topic, is that government’s issue debt to allow the central bank to maintain a specific short-term interest rate target. Central banks have traditionally used government debt as an interest-rate maintenance tool. But that is a function of the debt rather than being the motivation for issuing the debt in the first place. So we explore those differences today as a means of clarifying the questions and confusions around this issue. This is Part 1 of a two-part series, which I will finish tomorrow.