Table 1 Cost Path for Scenarios 1 and 2 in the N-Person Model

t = 0

Potentially Traumatic Experience

n individuals take the online self-evaluation test.

Costs: n·IDC ₀(A ₁)

Potentially Traumatic Experience

No one takes the test.

Costs = 0

t = 1

Proportion π need therapy.

Costs: n·π·STC ₁(A ₁)

(1-π) are not ill and do not need therapy.

Proportion π need therapy.

Costs: n·π·LTC ₁(A ₂)

(1-π) are not ill and do not need therapy.

Resulting total costs:

$n\cdot ID{C}_0(A_1)+\frac{n\cdot \pi \cdot ST{C}_1(A_1)}{(1+i)}$

Resulting total costs:

$\frac{n\cdot \pi \cdot LT{C}_1(A_2)}{(1+i)}$