${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_r\text{e}\text{f}\text{e}\text{r}\text{s}to\text{p}\text{r}\text{o}\text{v}\text{i}\text{d}\text{i}\text{n}\text{g}\text{a}\text{u}\text{n}\text{i}\text{q}\text{u}\text{e}\text{s}\text{o}\text{l}\text{u}\text{t}\text{i}\text{o}\text{n}\text{f}\text{o}\text{r}\text{e}\text{a}\text{c}\text{h}\text{c}\text{u}\text{s}\text{t}\text{o}\text{m}\text{e}\text{r}on\text{a}\text{l}\text{a}\text{r}\text{g}\text{e}\text{s}\text{c}\text{a}\text{l}\text{e}\text{.}}$

${?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}$ refers $to$ providing a unique solution for each customer $on$ a large scale.

One$-to-$one marketing

Mass customization

Niche marketing

Permission marketing

Multisegment marketing