A hedging or trading approach that combines multiple financial instruments, typically options, in a way that the total net cost is zero, meaning the premiums paid are fully offset by the premiums received. These strategies are designed to provide risk management or speculative benefits without requiring upfront cash outlay. 

Zero cost strategies are commonly used in foreign exchange and commodity markets to establish defined protection and participation ranges, while avoiding the budgetary impact of purchasing standalone options. They rely on a balance between the value of the bought and sold instruments, often involving collars, risk reversals, or synthetic structures. 

For example, a company concerned about downside currency risk may buy a put option for protection and simultaneously sell a call option to offset the premium cost. This creates a zero-cost collar, a widely used type of zero cost strategy that caps both losses and gains within a predefined range. 

While attractive for their cost neutrality, zero cost strategies come with trade-offs: they limit upside potential and often involve conditional outcomes or obligations. Successful implementation requires careful alignment of strike prices, maturities, and market views. These strategies are particularly valuable in environments where hedging budgets are constrained or when maintaining liquidity is a priority.