Interest Rates: As a bond ETF, PSB.TO's price is highly sensitive to interest rate changes. Rising rates generally cause bond prices to fall, and vice versa.

Credit Spreads: Widening credit spreads (the difference between yields on corporate bonds and government bonds) can negatively affect PSB.TO's price, indicating increased risk aversion.

Economic Outlook: Stronger economic growth may lead to expectations of higher inflation and interest rates, potentially decreasing bond prices. Conversely, weak growth may boost demand for bonds.

Inflation Expectations: Higher inflation erodes the real value of fixed-income investments, potentially causing bond prices to decline as investors demand higher yields to compensate.

Supply and Demand: Like any security, the price of PSB.TO is influenced by the overall supply of the ETF units and the demand from investors. Increased demand can drive up the price.

Market Sentiment: General investor optimism or pessimism can impact bond ETF prices. "Risk-off" sentiment often drives investors to safe-haven assets like bonds, increasing prices, while "risk-on" sentiment has the opposite effect.