What is a primary strength of the product life cycle theory?

The product life cycle theory is notable for its emphasis on the dynamic changes that can occur in trade patterns over time. This theory posits that products go through several stages: introduction, growth, maturity, and decline. As a product evolves through these stages, the patterns of trade associated with it can change significantly. For example, a product may initially be produced and exported from a developed country during the introduction stage, but as it matures and production becomes standardized, manufacturing may shift to developing countries where labor costs are lower. This adaptability to changing economic conditions and consumer preferences highlights the theory's ability to reflect the realities of global trade over time.

In contrast to this choice, the other options do not encapsulate the essence of the product life cycle. Static trade patterns suggest a lack of change, which contradicts the theory's foundational principle. Additionally, the focus on domestic products does not align with the theory, which encompasses global trade implications. Lastly, overlooking government roles in trade does not capture the complexity of the trade environment and the influence of policies and regulations that can impact product life cycles. Therefore, the correct answer underscores the theory's strength in accounting for the dynamic nature of global trade.