Final answer:
The likely reason for constant changes in the marketing strategy for an entrepreneur is that there have been too many difficult-to-predict external factors. Business failures can happen due to various reasons, including shifts in demand and supply, tough competition, and poor management. However, business exits can be necessary to maintain a flexible market-oriented system.
Step-by-step explanation:
If the entrepreneur is constantly faced with significant changes in the marketing strategy, it is likely that there have been too many external factors that were difficult to predict. Business failures can occur due to a variety of reasons, including shifts in demand and supply in the market, tough competition, poor management, and unproductive workers.
With millions of businesses in the economy, even a small fraction of them failing can have a significant impact on workers and managers. However, from the perspective of the overall economic system, business exits are sometimes necessary to maintain a flexible mechanism for satisfying customers and reducing costs.
However, often changes in the marketing strategy arise because of too many external factors that were difficult to predict. Businesses may face shifts in consumer tastes, technological advancements, changes in the economic environment, or new competitive actions that were not anticipated in the original plan.
This means that even with a well-prepared strategy and diligent monitoring, the entrepreneur may still need to adapt due to external circumstances beyond their control.
Therefore the correct option is 4) there have been too many external factors that were difficult to predict.