The document summarizes findings from an investigation into instances of fraud related to in-app transactions and app installs. It analyzes data from over 10 billion click events and 200 million in-app transactions to measure two key metrics: click fraud rates and in-app purchase fraud rates. The analysis finds global click fraud and in-app purchase fraud rates that are multiples of the rates in countries with the lowest levels of fraud. It also provides country-by-country comparisons of fraud rates and recommendations for preventing fraud.