#selector {
    polygon-fill: ramp([avg_price], colorbrewer(Reds), jenks());
}
/*
Expected output:

#selector {
    polygon-fill: #fee5d9;
    [ avg_price > 100000 ] {
        polygon-fill: #fcae91
    }
    [ avg_price > 250000 ] {
        polygon-fill: #fb6a4a
    }
    [ avg_price > 500000 ] {
        polygon-fill: #de2d26
    }
    [ avg_price > 1000000 ] {
        polygon-fill: #a50f15
    }
}
*/