Cazals, Catherine, Magnac, Thierry, Rodriguez, Frank, Pope, Jonathan and Soteri, Soterios (2022) Has the Covid pandemic accelerated the rate of decline in business letters? Some early and preliminary analysis and thoughts. In: The economics of the postal and delivery sector: Business strategies for an essential service Parcu, Pier Luigi, Brennan, Timothy J. and Glass, David Victor (eds.) Springer. Series “Topics in Regulatory Economics and Policy” Cham ISBN 978-3-030-82692-5