Washington blames China’s dominance of the solar industry on what are routinely dubbed “unfair trade practices.” But that’s just a comforting myth. China’s edge doesn’t come from a conspiratorial plot hatched by an authoritarian government. It hasn’t been driven by state-owned manufacturers, subsidized loans to factories, tariffs on imported modules or theft of foreign technological expertise. Instead, it’s come from private businesses convinced of a bright future, investing aggressively and ...