If Adrian chooses not to make the purchase because the risks are too high, he will

-If Adrian chooses not to make the purchase because  the risks are too high, he will be  avoiding risk.

-If he asks his brother to join in as an investor and  partner in the business, he will be  sharing risk.

Explanation:

Entrepreneur risk is the chance of profit or loss that results from doing business. The risk of loss may consist in a loss of the equity capital employed, but also when the success of employing the entrepreneurial staff is uncertain.  The general entrepreneur risk manifests itself in the danger that the actual future overall development of the company deviates unfavorably from the planned data.

Therefore, in the hypothesis of the question, if Adrian did not buy the good for its high cost, he would be avoiding the risk of losing money in a bad investment. In turn, if he shared the expense with his brother, he would be sharing that risk.