Traditional literature on sampling techniques focuses mainly on statistical samples and covers non-random (non-statistical) samples only marginally. Nevertheless, there has been a recent revival of interest in non-statistical samples, given their widespread use in certain fields like government...

This article reviews how Spanish deposit-taking institutions' net interest income has evolved in recent years and explores the main underlying factors, which include the low levels of interest rates. For this purpose, three alternative breakdowns of net interest income are considered. The first...