Browsing by Author "Vargas Cisternas, Nicolas Alejandro"

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    A mean-variance optimisation model for produce export distribution with postponed shipment and market allocation options
    (2025) Vargas Cisternas, Nicolas Alejandro; Klapp Belmar, Mathias Alberto; Mac Cawley Vergara, Alejandro Francisco
    Global exporters of fresh agricultural produce must determine where and when to ship their goods while facing significant price volatility in their sales markets. Unlike non-perishable commodities, agricultural produce cannot be relocated once shipped, eliminating any opportunity for arbitrage across markets. To address this problem, we present a decision-support tool for fresh produce exporters based on a two-stage stochastic optimisation model that extends Markowitz's Mean–Variance model. Our proposed model implements three risk-mitigation strategies: distribute shipments across multiple markets, use two shipping periods, and delay a fraction of market allocation decisions. Diversifying exports across markets and shipment times enables the exporter to capitalise on negative price correlations, while delaying allocations reduces uncertainty with updated price information. We empirically tested our approach using real Chilean grape export price data to simulate price scenarios and compare our model's results with two benchmark models: one that assumes one shipment period, and another that allows two shipment periods but decides all allocations in advance, without adapting to newly revealed information. Our model significantly outperforms both benchmarks, indicating the value of the three risk-mitigation strategies. Furthermore, as inventory costs increase, the value of postponement decreases; also, having a wider range of markets, with negative correlation, adds value.