Update economic_kernel.py

def economic_kernel(commodity, anchor, macro):
    gdp_factor = 1.0
    if macro["global_gdp"]:
        gdp_factor = macro["global_gdp"] / 1e14

    return {
        "commodity": commodity,
        "supply": anchor * gdp_factor,
        "demand": anchor * 0.95 * gdp_factor,
        "price_index": round(anchor / 10 * gdp_factor, 2),
        "currency_flow": anchor * 0.9 * gdp_factor,
    }