The payoff of inflation linked cashflows involves the ratio of reference values and with . The following approximation is used:

where is an approximately linear function, is the cashflow payment date and is a forward measure conditional at time . This approximation ignores the convexity correction which is dependent on the underlying inflation model.

## YieldInflationCashflowListDeal

This pays a fixed coupon on an inflation indexed principal. Define the following:

- the principal amount
- the base reference date
- the final reference date
- the accrual start date
- the accrual end date
- the accrual daycount from to
- the fixed yield
- is the rate multiplier

The cashflow payoff is