The following gist shows the job of a model in MVP via an example.

JobOfModel.java

class Model {
    UserModelHelper userModel;
    RecipeModelHelper recipeModel;
    NetworkManager networkManager;
    /*
    Make the constructor here and initialize the model helpers   
    like UserModel and other managers
    */
   
    /* Checks if the account is premium or not. Throws an 
    exception if not, otherwise proceeds with network call.
    The business logic is to only give this option to
    the premium account holders. This type of logic goes
    in the model*/
    List<Recipe> onLoadRecipes() {
        if (userModel.isAccountPremium()) {
            // Fetches the recipes
            Result result = networkManager.getRecipes();
            // Saves the recipes data
            recipeModel.saveRecipes(result.getRecipes());
            // Send the result back to the presenter.
            return result.getRecipes();
        } else {
            /* We can show an upgrade dialog when we catch      
            this */
            throw new UpgradeAccountException();
        }
    }
}