Corruption occurs at various scales and has many causes according to the document. It defines petty, grand, and systemic corruption. Petty corruption occurs at small scales like registration offices, while grand corruption occurs at the highest levels of government. Systemic corruption is due to weaknesses in organizations. The document lists causes of corruption like poverty, greed, lack of policies and education, and giving authority to unqualified people. It proposes solutions like allowing free expression, strict policies and accountability, protecting whistleblowers, international cooperation, and punishing corruption.