Ever figure what motivates people?  It's easy--and it works with everyone you know (including loved ones)--and it's just as valid in literature. This is another example of why reading literature makes a difference: it teaches us values and ethics about people's choices, behaviors, and cause-and-effect:
Love, Money, Power, or Fear.  
Three of
 them are  constants in our life (Primary), and one is not important 
(Secondary).   The trick is to know which are yours, and see how you
 match each  other (in relationships), or just being aware of your 
personal "hot  buttons." (For reference: I realize now that I'm definitely about Power (or Empowerment of myself and Others. I'm about Love: helping/sharing/giving to others to express my values and support them as a Global Family. And I'm surprised--but accept--that I have certain Fear issues of Abandonment and Security because I've had so much upheaval in my life, and a lot of it was from not understanding my own thinking processes with ADD and a learning disorder that I am still working to overcome.) Money? It's a game to me: an illusion. As the CEO said in "Margin Call", it's just paper with numbers and images on it so that we don't have to kill each other to get something to eat.
They 
each have a  positive and negative reinforcement as motivators in our 
lives,  depending on which ones are Primaries.  Again, the rule is that three of  four are Primaries:  these are the factors which motivate 
and  inspire each of us, and the remaining one (Secondary) are not of 
 consideration nor consequence when it comes to decision-making  
processes.  Our relationships that succeed or fail, whether personal or 
 professional, can depend heavily on how well matched we are with a  
Significant Other who mirrors back a similar Primary.

 
 Love as a Positive Primary brings
  someone a warm feeling of appreciation for living things, human or  
otherwise; they are very attuned to the flow of energy that sustains all
  that exists.  Some of these people are healers or work with support  
systems that enhance or encourage people, animals, plants, or other  
creatures to be maintained or thrive.  Love as a Positive Primary can be
  very spiritual; it is a natural part of this type to be affectionate  
and seek out others who enjoy receiving and giving this energy.
As
  a Negative Primary, these people can be overcome by jealousy and  
possessiveness.  They may be envious of others who receive or give  
affection or displays of love.  Some people who use Love as a Negative  
Primary force do not let other people find fulfillment in romantic  
situations:  a parent or partner who deliberately uses control of Love  
is such a person.
 
Money as a Positive Primary can
  be seen through people who are resourceful, inventive, generous, and  
philanthropic; they are willing to share with others who are in need.   
Possessions and property are not theirs exclusively; they are aware of  
being supportive and encouraging in motivating others to reach their  
goals or just keep trying and not quit.  Professor Muhammad Yunus and  
his efforts to provide micro-loans to women who needed financial  
assistance to break the cycle of poverty is one example.  This is more  
than just giving to charities too:  this is realizing that Manifestation
  is a gift that everyone can create and use.  
Something 
  as simple as the "pay it forward" method of giving to someone who 
needs  assistance and then letting them extend the same opportunity to 
someone  else in need would be such a method.  The Native American 
tradition of  potlatch is an example:  The potlatch is a festival or 
ceremony   practiced among Indigenous peoples of the Pacific Northwest 
Coast. At  these gatherings a family or hereditary leader hosts guests 
in their  family's house and holds a feast for their guests. The main 
purpose of  the potlatch is the re-distribution and reciprocity of 
wealth.
Different events take place during a potlatch, like either singing and  
dances, sometimes with masks or regalia, such as Chilkat blankets, the  
barter of wealth through gifts, such as dried foods, sugar, flour, or  
other material things, and sometimes money. For many potlatches,  
spiritual ceremonies take place for different occasions. This is either 
 through material wealth such as foods and goods or non-material things 
 such as songs and dances. 
As
  a Negative Primary, Money can be a crippling need for wealth at the  
cost of others' lives:  slavery is one example.  Greed, miserliness, and
  the abuse of others at any price is another.  The monetary system in  
general (not barter) has many examples of how financial means can become
  an abusive method of controlling people.

 
Power as a Positive Primary brings
  out the best in creative visualization and faith in one's values if  
they are used to help and assist others and life in general.  This is  
the realm of believing in one's goals, as well as helping others to  
reach theirs.  It is more than physical strength; this is spiritual  
strength and empowerment, and the purpose of having a dream to pursue.  
 Some people go into various methods of Life Coaching, including sports,
  in order to help others fulfill their destinies.  The late college  
basketball coach, John Wooden of UCLA, is a great example.  Jaime  
Escalante, the high school math teacher who encouraged his students to  
break free of the poverty mentality of their East Los Angeles upbringing
  and go on to college, is another.  
As
  a Negative Primary, Power can certainly be seen as a control factor.  
 The use and abuse of Love, Money, and Fear to frighten and weaken 
others  can be seen throughout the history of Mankind through the works 
of  literature and other means of expressing and recording the stories 
of  people and their efforts.  Domination, tyranny, and competitiveness 
that  overwhelms others at the price of their freedom (again, slavery 
and  conquest being two examples) finds justification in the eyes and 
minds  of people who believe that "Might Makes Right."
  
  Fear as a Positive Primary is
  often misunderstood as a weakness, but it has a proper place.  
Caution,  security, and deliberate, proper planning are excellent ways 
of being  sure and confident of one's plans or position in life.  Such 
people are  often slow to respond, but are determined and successful.  I
 would place  investor Warren Buffet here because of the rules he 
follows regarding  his strategies about money:  don't lose it, and don't
 take unnecessary  risks.
As
  a Negative Primary, Fear is used by people who are afraid; the word  
"afraid" itself often appears in their language.  They can be  
intimidated easily and reduced to positions of self-doubt and worry.  I 
 consider such people to "drive with one foot on the gas and one foot on
  the brake"; they often are hesitant to take control of opportunities 
for  themselves, and can be overwhelmed by emotional factors and  
insecurities.  Death as a topic and the fear of the unknown after death 
 is another part of a Fear-based Negative Primary; it has been used for 
 centuries as a means of controlling people's values and resources. Rejection and struggles with society can also be a Fear-factor. I realize after 65 years of life that I'm on the autism spectrum as a high-functioning adult; yet I still struggle to overcome matters when dealing with the public-at-large and in personal encounters.
I
  personally respond to Love and Power--and to my dismay, Fear. A lifetime of loss has left a mark on me.  I know I'm someone who has  
sought Love throughout my life; it's brought me many broken hearts and  
much growth.  I also have issues with Power; I realize that my  
inferiority complex as a child was the result of being too smart and  
unable to find a comfortable place with my family's position (they were 
 very motivated by Power and Money).  I never related well to Money; 
it's  a false entity to me, and one that has been used for centuries to 
 control and manipulate people. I can be very brave, but Fear still sounds like a plucked bowstring in my soul that leaves a note I feel with anguish. Such is Life, even though I am grateful for the challenges I've faced because it's brought me Wisdom.