This paper studies the inventory system of a retailer who orders his products from two supply sources, a local one that is responsive and reliable, but expensive, and a global one that is low-cost but less reliable. The deliveries from the global source only partially satisfy the quality...

According to economic theory, there are no strong reasons to tax (or to subsidise) residential moves, although low levels of taxation may be potentially justified to deal with the presence of externalities and economic stability. This is in contrast to practise in most countries where...