Developments related to COVID-19, which was declared a global pandemic by the World Health Organization in March 2020, have adversely impacted, and may continue to adversely impact our business and results of operations. The impacts of COVID-19 have included the loss of revenues due to store closures, reduced store-level operations, full or partial dining room closures and other restrictions on our business and operations. During 2021 and 2022, the overall adverse impact of COVID-19 on our operations was less significant than in 2020, but we continued to see negative impacts as of the end of 2022 due to COVID-19 outbreaks and resulting government restrictions limiting mobility, difficulty in hiring employees, availability of key ingredients and inflationary pressures across multiple parts of our business.
Conversely, for our restaurants that prominently feature carryout and delivery options, the pandemic has in many cases contributed to an increase in sales since the onset of the pandemic. If the impact of the pandemic continues to recede and the restaurant industry in general returns to more normal operations, the benefits to sales experienced by certain of our restaurants could wane and our results could be negatively impacted.
We and our franchisees have made operational changes intended to safeguard employees and customers in response to COVID-19. These operational changes have increased and may continue to increase restaurant operating costs and impact restaurant-level margins and return on invested capital. Our and our franchisees' restaurants have also experienced, and may continue to experience, interruptions of food and other supplies as well as labor shortages. In addition, the COVID-19 pandemic has required and may continue to require us to implement certain precautionary measures, such as in relation to vaccinations, testing and face coverings, which could adversely impact our operations, employee retention and satisfaction, and the willingness of customers to visit our restaurants.
Our success is heavily reliant on our Concepts' franchisees, and the COVID-19 pandemic has caused and may continue to cause financial distress for certain franchisees, particularly those located in areas most significantly impacted by the COVID-19 pandemic. As a result of this distress, certain of our franchisees have been unable to, or in the future may be unable to, meet their financial obligations to us as they come due, including the payment of royalties, or other amounts due to us. Additionally, certain of our franchisees have been unable to, or in the future may be unable to make payments to landlords, distributors and key suppliers, as well as payments to service any debt they may have outstanding. Franchisee financial distress has also led to, and may continue to lead to, permanent store closures and delayed or reduced new franchisee development, which may further harm our results and liquidity.
We are unable to fully predict the impact that COVID-19 will have on our and our franchisees' operations going forward due to various uncertainties, including the severity and duration of the pandemic, the timing, availability acceptance and effectiveness of medical treatments and vaccines, the spread of potentially more contagious and/or virulent forms of COVID-19, including variants that may be more resistant to currently available vaccines and treatments, the extent to which COVID-19 may cause customers to continue to be reluctant to return to in-restaurant dining or otherwise change their consumption patterns (including after the COVID-19 pandemic has ended), actions that may be taken by governmental authorities, and the extent to which ongoing governmental restrictions in certain regions will be lifted, and the ongoing impact of the pandemic on economic conditions in the U.S. and globally.
We could be materially impacted in the future if a more severe variant would arise causing disruptions far more severe than we have experienced. In such circumstances, Sadot may be unable to perform fully on its contractual obligations, critical global supply chain and logistical networks may be affected, and costs and working capital needs may increase. These cost increases may not be fully recoverable or adequately covered by insurance. In addition, demand for certain products that Sadot produces, particularly ingredients that go into food and beverages that support the food services channels, could be materially impacted from a prolonged COVID-19 variant outbreak or significant local resurgences of the virus, leading to additional government-imposed lockdowns, quarantines, or other restrictions.
Moreover, if conditions related to the COVID-19 pandemic result in significant disruptions to capital and financial markets, or negatively impact our credit ratings, our cost of borrowing, our ability to access capital on favorable terms and our overall liquidity and capital structure could be adversely impacted.