A sequence is postulated, through which today's mission-dominated space enterprise may begin the transition into a self-sustaining space-based economy dominated by extraterrestrial resources and services. A set of 15 enterprises is considered, that define the basis for the expansion to another 15 larger enterprises. Examples of the first four enterprises are given. Interactions between these enterprises are projected to enable an order of magnitude reduction in the cost of access to geosynchronous orbit.
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