(cont.) that threaten to disappear cause decision makers to invest more effort and money in order to keep these options open, even when the options themselves seem to be of little interest. The last experiment provides initial evidence that the mechanism underlying the tendency to keep doors...

The long-run effect of banner advertisements is among the most complex topic in the internet world. Media spending on online marketing has grown from $3 billion in 1999 to $9 billion in 2004. Forecasts (Jupiter Research 2005) expect this growth to double in the next five years. The proportion of...