Saving is viewed as deferred consumption and studied within the framework of intertemporal choice. The literature, drawn from psychology, economics and economic psychology, suggests that whilst there have been many theoretical references to the relationship between individual differences associated with intertemporal decision-making and saving, and these individual difference variables have been studied in relation to other behaviour, there is a lack of empirical research investigating their relationship with saving. The particular variables of interest are delay of gratification, time preference (impatience), self control, impulsiveness and consideration of future consequences. This thesis presents a series of empirical studies which used carefully constructed or selected measures to investigate the relationship between individual differences associated with intertemporal decision-making and saving. A variety of methods were used. The first two studies measured delay of gratification using a behavioural choice paradigm and investigated its relationship with saving. The next three studies measured a construct known as the consideration of future consequences and examined its relationship with saving. In-depth interviews, focusing on impulsiveness and impatience provided a more realistic investigation of the personality structure of delay, and aided the development of quantitative measures of impulsiveness. Secondary analysis of Dutch panel data enabled the hypotheses to be tested with a larger dataset and shifts in assets as a measure of saving. The group of studies culminated in a postal survey of married couple households, allowing a multivariate investigation of all the individual difference constructs which had been developed and investigated. This final study also addressed issues such as the relative influence of psychological data from both spouses in a decision-making unit. The results are discussed throughout the thesis in the light of their implications for psychology, economics, policy-making and marketing, as well as for economic psychology. The main contributions are some new measures of theoretically relevant individual difference constructs, which will require further testing in order to prove their worth