ProShares Ultra Short Bloomberg Crude Oil ETF (BIB.US) price is affected by: Crude Oil Prices: BIB is designed to deliver twice the inverse of the daily performance of the Bloomberg Crude Oil Subindex. Therefore, declining crude oil prices generally lead to an increase in BIB's price, and vice versa.

Daily Resetting: BIB's leverage and inverse exposure are reset daily. This means that its performance over periods longer than one day can significantly deviate from a simple multiple of the underlying index's performance, especially in volatile markets.

Volatility: High volatility in crude oil prices can erode BIB's value over time, even if crude oil prices remain relatively stable overall. This is due to the compounding effect of daily resetting.

Interest Rates: Changes in interest rates can indirectly affect BIB's price by influencing investor sentiment towards crude oil and other commodities. Higher interest rates can sometimes dampen demand for commodities, potentially leading to lower crude oil prices and higher BIB prices.

Supply and Demand for BIB Shares: Like any ETF, BIB's price is also influenced by the supply and demand for its own shares. If demand for BIB increases, its price may rise, and vice versa.

Fund Management Fees and Expenses: BIB has management fees and other operating expenses, which are deducted from the fund's assets and can slightly impact its overall performance and price.

Market Sentiment: General market sentiment and investor risk appetite can influence the demand for and price of BIB. During periods of market uncertainty, investors may seek inverse or leveraged products like BIB, potentially driving up its price.