Abstract: Comprises three essays on the economics of health-care delivery in hospitals: considers the relationship between gender and/or ethnic concordance between a doctor and patient, and the number of diagnostic tests ordered during a hospital stay; estimates the impact of doctor-patient demographic concordance (where doctor and patient share the same ethnic group and/or gender) on a doctor's decision-making for diagnostic resources and medical treatments; calculates the relationship between ward-level nursing hours and a patient's health outcome, e.g. mortality and length of ward stay. Uses a detailed nursing-staff dataset, a novel instrumental variable for nursing hours (the amount of sick and bereavement leave taken by nurses on a ward) and the separate effect of nursing and patient hours in a ward, on a patient's health outcome.