Biomanufacturers seeking the best approach to rapid implementation of flexible manufacturing capacity take into account the benefits presented by different modular construction options. We analyzed different approaches to building manufacturing capacity and assessed the economic benefits of each approach. Our evaluation was based on biopharmaceutical products for which there is an immediate unmet need, such as treatments or vaccinations for COVID-19. Such products also might entail a sudden increase in demand (e.g., expansion of a product indication or sales ramp…