A large manufacturing firm is experiencing low productivity, which management attributes to a lack of employee effort. To solve this, a consultant proposes a 20% wage increase for all production workers. The consultant's argument is that this higher wage will make employees value their jobs more, and the fear of being fired for low effort will become a more powerful motivator, thus increasing productivity. Critically evaluate this proposal. Is this wage increase, implemented in isolation, a guaranteed long-term solution for the firm? Justify your position by discussing at least two distinct economic conditions external to the firm that could either strengthen or severely weaken the effectiveness of this strategy.