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Property prices are influenced by a variety of factors. One of these factors is the crime rate in the surrounding area. Sam is a property developer, who develops properties in Fortitude Valley. Crime is a serious issue affecting Fortitude Valley. In order to reduce the amount of crime occurring in the area, Sam organises a neighbourhood watch program. This program relies on property owners monitoring their own neighbourhood, including other residents' properties, and reporting any suspicious activities to police. Which of the following statements are true: O Sam's decision to organise a neighbourhood watch program has nothing to do with externalities. O Sam's decision to organise a neighbourhood watch program is a negative externality for a shop owner called Al. Previously, Al had to pay money to other Fortitude Valley shop owners for protection against crime. O Sam's decision to organise a neighbourhood watch program is a positive externality for Pete - a shop owner who has been robbed several times previously. The neighbour watch program would be economically inefficient if the marginal benefits were greater than the marginal costs