def market_cap(df, min_cap=200):
    """filters out stocks that don't meet the min_cap minimum capitalization
    criteria.

    :df: dataframe
    :min_cap: minimum market_cap number (*1 million) for stocks to include in
        stock universe (default = 200)
    :returns: Dataframe with stocks that have market capitalization>min_cap

    """

    df_allstocks = df[df.Market_Cap_Q1>200]

    return df_allstocks