First profitable step-by-step to a self-sufficient private sector space business community in era of high launch costs. Explains role of spaceship ferry craft, spinships, asteroid miners, ascenders and translunar space. Shows how to build a space-based economic system of high revenues and low costs. Describes low cost delivery to earth from asteroid mining vessels. Reveals three habitat types necessary for self-sustaining space business. Explains how division of risk, ownership and spinship staged construction lowers costs, and finances the space trade. Explains environmentally friendly, low cost to orbit launch system. Lists the ages of space trade development. Lists ways the space trade saves the earth. Builds upon seminal works such as: "Mining the Sky," by John S. Lewis; "The High Frontier," by Dr. Gerard K. O'Neill; and, "Floating to Space," by John M. Powell.