Consider whether costs vary spatially.

Sev­er­al costs can vary spa­tial­ly and this can affect how and where a strat­e­gy is best deployed (con­sid­ered in the pre­vi­ous step) and how we inter­pret ROI. For exam­ple, if high con­ser­va­tion impacts are expect­ed in areas with low costs, we will see a high­er over­all ROI than if high con­ser­va­tion impacts occur in areas with high costs.