Six rules defining the methods by which we defend our current positions until new positions are established.
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This article explains Sun Tzu's strategy is based on simple economics and that economics starts with defense. We get resources from our current position. We can use these resources to defend our position, advance, and extend it. However, all resources are limited. We must make choices about how to use our resources. The problem is that we can only advance our position when an opportunity presents itself. Until we discover that opportunity, we must maintain our existing position. We need our position because opportunities arise from our environment within the reach of our existing position. If we do not protect our existing position, opportunities cannot come knocking. Everything that has been part of our position in the past need not be defended forever, but we must always defend the parts of our position that touch on future opportunities.