The Washington Consensus reform resulted in economic collapse and stagnation in many transition economies and "lost decades" in other developing countries in 1980s and 1990s. The paper provides a new structural economics perspective of such failures. The Washington Consensus reform failed to recognize that many firms in a transition economy were not viable in an open, competitive market because those industries went against the comparative advantages determined by the economy's endowment structure. Their survival relied on the government's protections and subsidies through various interventions and distortions. The Washington Consensus advised the government to focus their reforms on issues related to property rights, corporate governance, government interventions, and other issues that may obstruct a firm's normal management. Without resolving the firms' viability problem, such reforms led to the firms' collapse and an unintended decline and stagnation of the economy in the transition process. This paper suggests that the viability assumption in neoclassical economics be relaxed when analyzing development and transition issues in socialist, transition, and developing economies.