Which is a common indicator of espionage?

Unexplained affluence is a significant indicator of espionage because it suggests that an individual may be benefiting financially from illicit information or activities. When someone displays a lifestyle that seems disproportionate to their known income or job, it raises questions about how they can afford such luxuries. This could involve high-end purchases, sudden wealth, or a lifestyle that appears inconsistent with their official salary or financial background. In the context of counterintelligence, unexplained affluence can often point to potential involvement in espionage, as individuals might be receiving payment for sensitive or classified information.

Other factors such as frequent social engagements, regular business travel, or participation in community service are often normal behaviors that do not inherently suggest espionage. In contrast, unexplained affluence stands out as a clear potential warning sign that someone may be engaged in activities that compromise national security or sensitive information. This makes it an important focus area for counterintelligence efforts.