  We revisit a one-parameter family of three-dimensional gauge theories with
known supergravity duals. We show that three infrared behaviors are possible.
For generic values of the parameter, the theories exhibit a mass gap but no
confinement, meaning no linear quark-antiquark potential; for one limiting
value of the parameter the theory flows to an infrared fixed point; and for
another limiting value it exhibits both a mass gap and confinement. Theories
close to these limiting values exhibit quasi-conformal and quasi-confining
dynamics, respectively. Eleven-dimensional supergravity provides a simple,
geometric explanation of these features.
