Wor that means return kindness in relationship?

On 8/15/2014 I hear a word on Steve Harvey radio show and Tommy asked what it meant. Karla told him it meant return kindness. I think it begins with a

On 8/15/2014 I hear a word on Steve Harvey radio show and Tommy asked what it meant. Karla told him it meant return kindness. I think it begins with a r.

or:On 8/15/2014 I hear a word on Steve Harvey radio show and Tommy asked what it meant. Karla told him it meant return kindness. I think it begins with a r.

or:Reciprocity in social psychology refers to responding to a positive action with another positive action, rewarding kind actions. As a social construct, reciprocity means that in response to friendly actions, people are frequently much nicer and much more cooperative than predicted by the self-interest model; conversely, in response to hostile actions they are frequently much more nasty and even brutal.

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