string GetMarketingActivity(string text, GameEntity product)
    {
        var churn = Marketing.GetChurnRate(product, Q);

        var joinedChannels = product.companyMarketingActivities.Channels.Keys
                             .Select(k => Marketing.GetChannelClientGain(product, k))
                             .Sum();

        text += $"\n{(int)churn}% channels: " + Marketing.GetActiveChannelsCount(product) + $"  +{Format.Minify(joinedChannels)}\n";

        return(text);
    }