void UpdateFinances()
{
//revenue
ulong revenue = (ulong)Mathf.Round((float)simParam.baseFundsGainRate * statEffects.revenueEffectModifier) + statEffects.revenueEffectBonus;
finances.AddFunds(revenue);
//expenses
//excavation:
float excavationAreaInCells = Mathf.PI * Mathf.Pow(workPlan.excavationAreaRadius, 2.0f) / Mathf.Pow(Grid.cellSize, 2.0f);
ulong excavationExpense = (ulong)Mathf.RoundToInt(excavationAreaInCells * (float)simParam.baseExcavationCostPerCell);
//other
ulong buildingExpenses = GameManager.buildMan.ComputeBuildingsExpenses();
ulong wages = GameManager.popMan.ComputeTotalWages();
finances.SubtractFunds(excavationExpense + buildingExpenses + wages);
}