User B

User A

Knowledge sharing (y)

No knowledge sharing (1 − y)

Knowledge sharing (x)

$π_{A} + β_{A} l_{B} k_{B} + r h (1 - m) (k_{A} + k_{B}) - (1 - e) r c$ ,

$π_{B} + β_{B} l_{A} k_{A} + (1 - r) h (1 - m) (k_{A} + k_{B}) - (1 - e) (1 - r) c$

$π_{A} + h_{A} k_{A} - (1 - e) r c$ ,

$π_{B} + I_{B}$

No knowledge sharing (1 − x)

$π_{A} + I_{A}$ ,

$π_{B} + h_{B} k_{B} - (1 - e) (1 - r) c$

$π_{A}$ ,

$π_{B}$