49.
									
										Profits differs in its nature from the income of other factors of production because it is: 
									
								
															
														
																									
										A:
											A residual and therefore uncertain
									
																										
										B:
											 A result of highly skilled work 
									
																										
										C:
											Highly fluctuating in different business transactions
									
																										
										D:
											 Never in negative
									
																								 
							
																
									The answer is:
										A
									
								
														
							
								
								
							
							
							
								