internal void CalcMarketPrice()
{
var isOnsale = IsOnSale();
if (isOnsale || parent.IsClosed)
{
// reduce price
marketPriceModifier.subtract(0.001f, false);
if (marketPriceModifier.isZero())
{
marketPriceModifier.set(0.001f);
}
}
if (!isOnsale && parent.IsOpen) //rise price
{
marketPriceModifier.add(0.01f);
}
}