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AssetPricing: Optimal pricing of assets with fixed expiry date

Calculates the optimal price of assets (such as airline flight seats, hotel room bookings) whose value becomes zero after a fixed “expiry date”. Assumes potential customers arrive (possibly in groups) according to a known inhomogeneous Poisson process. Also assumes a known time-varying elasticity of demand (price sensitivity) function. Uses elementary techniques based on ordinary differential equations. Uses the package deSolve to effect the solution of these differential equations.