Henry Hacker, a professional golfer who was having some trouble with his driver, decided to skip the next two tournaments on the PGA tour to work with his swing coach. He paid his coach $1,000 and used $1,000 worth of golf balls. As a result, his driving must have improved considerably because he now hits his tee shots longer and straighter.

Classify the following costs, incurred by Henry during the time spent with his swing coach, as explicit or implicit opportunity costs.

Cost incurred	Category
The $1,000 spent on his swing coach.	▼ Implicit cost Explicit cost
The earnings were foregone by skipping the two tournaments on the PGA Tour.	▼ Explicit cost Implicit cost
The $1,000 spent on his golf balls.	▼ Explicit cost Implicit cost