In Global Economics for Managers, one core proposition of the institution-based view is that when formal constraints are weak or unclear, informal constraints become more influential, making option D the correct illustration.

In option D, although local laws allow firms to bypass certain environmental safety standards, company leaders choose not to do so because of deep ethical values and social responsibility norms. These informal constraints---values, moral commitments, and corporate culture---guide behavior in the absence of strong formal enforcement.

Option A reflects rational economic decision making within clear formal rules. Option B illustrates response to formal policy change. Option C involves avoidance of formal rules rather than reliance on informal constraints.

Thus, option D best demonstrates how informal institutions substitute for weak formal institutions in guiding firm behavior.