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Digital Preservation Network is no more - blog by David Rosenthal

The point of DPN was to use organizational and technological diversity to mitigate monoculture risk. Unfortunately, as Brian Arthur's 1994 Increasing Returns and Path Dependence in the Economy described, technology markets have increasing returns to scale. Thus as services scale up diversity becomes an increasingly expensive luxury, and monoculture risk increases. Fortunately, the winner then acquires too-big-to-fail robustness (see Amazon).