This dissertation consists of three essays that focus on consumer behavioral responses to the COVID-19 pandemic. Each essay describes a separate empirical study conducted to examine: (1) how the pandemic affected Internet search for mental health-related keywords, (2) how the pandemic-induced financial adversities affected the variation in mental health symptomatology of older Americans, and (3) how COVID-19-related income shocks affected financial decision-making regarding spending and saving of the government stimulus transfers. In Essay 1, I compare the intensity of Google.com queries for keywords related to mental health in the United States before and during the pandemic. Assuming that the volume of online searches proxied for the psychological condition of the society, I explore the roles of COVID-19-related deaths and the performance of the U.S. economy (as measured by the unemployment rate and the housing price index) as distinct potential contributors to changes in online search behavior. I find that a significant amount of variation in the Internet search intensity of mental health keywords during the pandemic can be explained by both COVID-19-related deaths and the unemployment rate. In Essay 2, I utilize microdata from the Health and Retirement Study and narrow the focus of my study to the vulnerable population segment, older adults. I examine the effect of financial adversities experienced during the COVID-19 pandemic on changes in the mental health of older adults as measured by the Center for Epidemiological Studies Depression scale, an instrument developed to measure depressive symptoms. I demonstrate that financial adversities experienced during the pandemic contributed to the deterioration of the mental health of older adults. The estimated effects are heterogeneous among the groups of respondents defined by retirement status and history of psychiatric problems. In Essay 3, I investigate how older adults responded to the pandemic-induced income shocks regarding their overall spending and spending out of 2020 Coronavirus Aid, Relief, and Economic Security Act stimulus payments. I establish that the negative income shocks experienced during the COVID-19 pandemic put downward pressure on household spending. The estimation results also reveal that, relative to those who did not experience an income shock, stimulus recipients who experienced income losses were more likely to use the stimulus transfer to increase spending, pay off debt, or for other purposes rather than to save.