If it does, then it means that the broker is a "market maker", then it means that every time you lose on a trade, the broker wins, therefore your best interests aren't necesssarily theirs, and vice versa!
Some forex brokers do not allow scalping as it takes more resources on their end to manage numerous small transactions that only last a few minutes (or seconds!). Some brokers offer super low spreads, but they lack other features and benefits, while some brokers have spreads that are considered average but they have all the bells and whistles that your trading style requires.
Managed accounts are great for two reasons: when you're starting out, you may prefer to let others (with a proven track record) do the trading for you. These forex account managers, commonly referred to as signal providers, use different trading techniques, but they always have a track record which you can look over and a description of the type of strategy they are using.
These signal providers get paid through the spread, so there are no added costs (and once you become an experienced and profitable trader, you can become a signal provider yourself, and get paid for providing these very same signals).
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