Explain why economists disagree and what the characteristics of public goods are.

a) Economists often disagree due to several factors:

• Differences in scientific judgments: They may hold different theories about how the economy operates or interpret empirical evidence in varying ways.
• Differences in values: Economic policy recommendations often involve normative judgments about what is desirable, which can vary among individuals.
• Different assumptions: Economic models rely on simplifying assumptions, and different assumptions can lead to different conclusions about economic phenomena or policy effectiveness.
• Complexity of the economy: The real world is complex, making it challenging to isolate variables and predict outcomes with certainty, leading to diverse perspectives.

b) Public goods have two main characteristics:

• Non-rivalry: This means that one person's consumption of the good does not reduce its availability for others. For example, many people can simultaneously enjoy a public park or a street light without diminishing its benefit to others.
• Non-excludability: This means it is difficult or impossible to prevent individuals from consuming the good, even if they do not pay for it. For instance, once a national defense system is in place, it protects all citizens, regardless of whether they contributed to its funding.