Fund Performance: WPSZX's past performance directly influences investor demand and, consequently, its price. Strong historical returns typically attract more investment, pushing the price upward.

Market Conditions: Overall market sentiment and economic factors significantly impact WPSZX. Positive market trends usually lead to higher prices, while downturns can cause declines.

Interest Rates: Changes in interest rates affect bond yields and overall investment attractiveness. Rising rates may reduce the value of fixed-income holdings within WPSZX.

Fund Management: The skill and strategy of the fund's management team play a critical role. Effective management can enhance returns and positively influence the price.

Expense Ratio: The fund's expense ratio impacts returns. Lower expenses generally lead to better net returns and a potentially higher price compared to similar, more expensive funds.

Investor Demand: High investor demand increases buying pressure, driving the price of WPSZX upward. Conversely, large redemptions can force the fund to sell assets, lowering the price.