The higher equilibrium wage in Market A ($W_{A2}$) incentivises some Systems Administrators to retrain and transition to cybersecurity. This reduces the supply of labour in Market B, shifting the supply curve leftwards from $S_1$ to $S_2$, which increases the equilibrium wage in Market B to $W_{B2}$ and reduces employment to $L_{B2}$.

The higher equilibrium wage in Market A ($W_{A2}$) increases the demand for complementary IT infrastructure. This shifts the demand curve in Market B rightwards, resulting in a higher equilibrium wage ($W_{B2}$) and an increased level of employment ($L_{B2}$) in Market B.

The expansion of employment in Market A ($L_{A2}$) creates a demonstration effect, attracting new school-leavers into the IT sector. This shifts the supply curve in Market B rightwards from $S_2$ to $S_1$, resulting in a lower equilibrium wage ($W_{B1}$) and a higher level of employment ($L_{B1}$) in Market B.

The shift in demand in Market A causes a wage-price spiral that reduces firms' profitability. To cut costs, firms in Market B reduce wages from $W_{B2}$ to $W_{B1}$ and increase employment from $L_{B2}$ to $L_{B1}$, shifting the supply curve rightwards.