def arbitrage_factor_required(volume_EUR=9000, net_gain_EUR=100):
    """
    Return the arbitrage factor required in order to make a specified net gain
    through the changing of a specified volume.

    Kraken EUR to BTC fee:       1.6 %
    Kraken BTC withdraw fee:     0.0005 BTC (~4.36 EUR 2018-03-06T1851Z)
    LBC sell fee:                1 %
    TransferWise GBP to EUR fee: 0.35 % + 0.8 GBP (~0.90 EUR 2018-03-06T1851Z)
    """
    return (net_gain_EUR + 4.36 + 0.9) / volume_EUR + 1 + 0.016 + 0.01 + 0.0035
