Answer:
buying is refer for small products
Purchasing is refer for contracts and big products
Explanation:
buying and purchasing are considered as synonyms and both term that are often used interchangeably, these both terms meaning to acquire something against money
Buying an item is considered general term and very commonly used to refer to everyday goods and buying is refer for small products
example ; I bought a new phone
and
Purchasing an item is considered to be more formal word than the buying an item and Purchasing is refer for contracts and big products
example ; I purchased a piece of land
