Underlying Assets: The primary driver is the performance of the underlying US Treasury bonds held by the ETF. Yield changes and price fluctuations in those bonds directly impact the ETF's value. Interest Rate Changes: Rising interest rates typically decrease bond prices, and vice versa, influencing the ETF's net asset value. Expectations of future rate hikes also affect the ETF. Supply and Demand: Market forces like investor demand can cause the ETF's trading price to deviate slightly from its net asset value (NAV). High demand pushes the price up, while selling pressure lowers it. Market Sentiment: Overall investor confidence or fear regarding the US economy and bond market affects demand for US Treasury ETFs like TUSB.TO. Inflation Expectations: Higher inflation erodes the real value of fixed income investments, potentially leading to lower bond prices and a decline in the ETF's value. Geopolitical Events: Global events can create uncertainty and volatility in financial markets, affecting bond yields and demand for safe-haven assets like US Treasuries.