Focusing works best (1) when it is costly or difficult for multi segment competitors
to meet the specialized needs of the niche, (2) when no other rival is
attempting to specialize in the same target segment; (3) when a firm doesn't
have enough resources to pursue a wider part of the total market; and ( 4) when
the industry has many different segments, thereby allowing a focuser to pick
an attractive segment suited to its strengths and capabilities.