F. W. Riggs's 'industria' model, a characteristic of developed, industrial societies within his prismatic-sala model, describes an economy marked by a high degree of differentiation, specialization, and interdependence. In such a system, various economic sectors and units are intricately linked, relying on each other for inputs, outputs, and overall functioning. This inherent complexity and interconnectedness in the economic sphere can indeed be seen as a precursor to several key features of post-modern Public Administration (PMPA).

Post-modern Public Administration emerged as a response to the limitations of traditional bureaucratic models and even New Public Management (NPM), recognizing the increasing complexity, uncertainty, and interconnectedness of public problems and governance. Here's how Riggs's 'industria' foreshadows PMPA:

1. Interdependence and Networked Governance: Riggs's 'industria' highlights economic interdependence, where no single unit operates in isolation. PMPA extends this concept to administrative interdependence, emphasizing that public services are delivered not by a monolithic state but through complex networks involving government agencies, private sector entities, non-governmental organizations, and citizens. The intricate web of relationships in 'industria' mirrors the multi-actor, multi-level governance networks characteristic of PMPA.

2. Complexity and Uncertainty: The advanced, interdependent economy of 'industria' naturally generates complex societal issues that cannot be addressed by simple, linear administrative solutions. This inherent complexity and the resulting uncertainty in policy outcomes are central concerns for PMPA, which advocates for adaptive, flexible, and context-sensitive approaches rather than universal, rigid blueprints. Riggs's work, by acknowledging the nuances of different societal types, laid groundwork for understanding administrative systems in their specific complex contexts.

3. Differentiation and Integration: In 'industria', specialized economic functions require sophisticated administrative coordination. Similarly, PMPA operates in an environment where public sector organizations are highly differentiated (e.g., specialized agencies, regulatory bodies) and there's a constant need for integration and collaboration across these specialized units, as well as with external partners, to achieve holistic policy outcomes. The challenge of coordinating diverse, specialized entities is common to both.

4. Blurring of Boundaries: The interdependence in 'industria' can lead to a blurring of lines between different economic sectors. In PMPA, this translates to a blurring of boundaries between the public, private, and third sectors, as well as between policy formulation and implementation. The state often acts as an enabler, facilitator, or regulator rather than solely a direct provider, reflecting a more fluid and interconnected administrative landscape.

5. Need for Adaptive Capacity: An interdependent economy is dynamic and subject to constant change, requiring adaptive responses from its administrative structures. PMPA similarly stresses the need for public administration to be agile, learning-oriented, and capable of adapting to rapidly changing societal demands and global challenges, moving away from static, rule-bound bureaucracies.

In essence, Riggs's 'industria' model, by depicting a highly differentiated and interdependent economic system, provided an early conceptual framework for understanding the kind of complex, interconnected environment that would later necessitate the shifts in administrative thinking embodied by post-modern Public Administration. It highlighted that administrative systems must evolve to match the complexity of the societies they serve, moving beyond simplistic, hierarchical views towards more nuanced, networked, and adaptive forms of governance.