Quaderni IRCrES-CNR, n. 2 2017 study design to analyse this main relation and explain possible reasons of high levels of salary in public administration. 2. Materials, Methods and Study Design The hypothesis of this study is the following (HP): HP: high levels of compensation for central government senior manager are positively associated to high levels of Members of Parliament (MPs') salaries, ceteris paribus. The present study ascertains whether empirical evidence substantiates the hypothesis (HP). The indicators of this study and sources of data are shown in Table 1. We focus on the annual compensation of central government senior managers. The level of total compensation for senior managers in the public sector is one indicator of the attractiveness of the public sector and of its ability to keep talent for positions with high levels of responsibility in government. Compensation in these positions represents a minimal share of public expenditures, but holds symbolic value as it concerns staff who have a leading role in government policy making and execution and whose appointment is often discretionary. D1 managers, following OECD definition, are top public servants below the minister or Secretary of State. In particular, D1 Managers are top public servants just below the minister or Secretary of State/junior minister. They can be a member of the senior civil service and/or appointed by the government or head of government2. 2 D1 managers differ from country to country but they correspond, mainly, to the figure of Ministry General Director. 9