${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{i}s\text{a}\text{c}\text{l}\text{a}\text{s}\text{s}\text{i}\text{f}\text{i}\text{c}\text{a}\text{t}\text{i}\text{o}\text{n}of\text{s}\text{o}\text{f}\text{t}\text{w}\text{a}\text{r}\text{e}\text{t}\text{h}\text{a}\text{t}\text{m}\text{o}\text{n}\text{i}\text{t}\text{o}\text{r}\text{s}\text{t}\text{r}\text{e}\text{n}\text{d}\text{s}\text{a}\text{m}\text{o}\text{n}\text{g}\text{c}\text{u}\text{s}\text{t}\text{o}\text{m}\text{e}\text{r}\text{s}\text{a}\text{n}\text{d}\text{u}\text{s}\text{e}\text{s}\text{t}\text{h}\text{i}\text{s}\text{d}\text{a}\text{t}\text{a}to\text{p}\text{e}\text{r}\text{s}\text{o}\text{n}\text{a}\text{l}\text{i}\text{z}\text{e}an\text{i}\text{n}\text{d}\text{i}\text{v}\text{i}\text{d}\text{u}\text{a}\text{l}\text{c}\text{u}\text{s}\text{t}\text{o}\text{m}\text{e}\text{r}\text{'}\text{s}\text{e}\text{x}\text{p}\text{e}\text{r}\text{i}\text{e}\text{n}\text{c}\text{e}\text{.}}$

${?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{i}s$ a classification $of$ software that monitors trends among customers and uses this data $to$ personalize $an$ individual customer's experience.

Price Asymmetry

Switching costs

Collaborative filtering

Price$-$elasticity