Individuals hold and exchange opinions over multiple issues. However, a unidimensional spectrum is often enough to represent all those. As our theoretical and experimental results indicate, opinion differences can reduce to disagreement on a single dimension when individuals communicate and...

We focus on changes in technology and campaign management to study the documented simultaneous increase in campaign spending and polarization. In our model, some voters are ideological while others are impressionable. If the distribution of voters between types is endogenous and depends on...