Thesis (Ph.D.)--Boston UniversityPLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.This dissertation presents three independent papers on macroeconomics. The first chapter, Durable Goods and Liquidity Constraints, studies how the presence of liquidity constraints affects the behavior of aggregate non-durable and durable expenditures in a model with transaction costs. The analysis shows that optimal consumption of non-durable goods in a model wit...