One quality of a successful leader is to make decisions quickly.

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Teacher Sophia

Here are your corrections:

A successful leader have to possess many qualities, and also he or she can make decision quickly too because it reduce the related costs.

>> A successful leader has to possess many qualities. He also needs to know how to decide quickly.
First, it could lessens the congestion cost.

>> First, it can lessen the expense.

If a leader can\'t decide about some issue and drag the time, the members feel confused how to do with reference to the matter. 

>> If the leader doesn\'t have a firm decision, the members will be confused.

Also each member acts according to their own judgement because of the lack of a leader\'s decision, and there are many confusion.

>> As a result, the members will decide on their own and it will create chaos and confusion.

Therefore much cost would be spent to correct the situation.

>> It will be costly to fix the situation.
Second, inopportune decision is worse than non-decision.

>> Second, inopportune decision is worse than no decision at all.

To specific, all decision have a opportune time and after that time, many conclusions would be obsolete. 

>> All decisions have an opportune time that leads to a useless conclusion.

For example, a company had to decide which industry would be adequate for next business, but the president couldn\'t make a decision for a long time and competitors took a market in advance.

>> For example, a company has to decide which industry would be adequate to open a new business but the president couldn\'t decide quickly. As a result, the competitors has already taken the advantage to explore the business.

As a result, the company ended up being demolished.

>> As a result, the company goes bankrupt.
In conclusion, making decision quickly is very important for a successful leader.

>> In conclusion, making a quick but firm decision is important for a successful leader.