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The indices of the supplyes are important why they supply to the management give to you most important on which then basing the entire business strategy. In fact excessive or insufficient a level of supplyes can generate in the more serious cases the failure of the company, or, in the cases blandi to have undesired effects like: Problems caused from excessive supplyes:

  • obsolescence of the material presents in the supplyes
  • impossibility to take advantage of the variations of the market prices well, when these are taken place
  • erosion of the liquid understood one them in the case of excessive purchase, placing the company in one situation not to be in a position to making forehead to the obligation short
  • increase of sure costs like: interests on purchases, storage, assurances and necessity of widening of the warehouses
Problems caused from insufficient supplyes like: delays in the deliveries,under using of resources (personal and machinery), breaches of stock.
For one corrected management of the supplyes he is not sufficient to characterize the level of the emergency supply, to determine the economic lottery of purchase and the point of I reorder, but it must hold under control also the other most important factors, if not vital, for one oculata management as as an example the time in which the assets sostano the warehouse (duration of the cycle of I renew).
The parameter more used and effective in order to appreciate the speed of circulation of the goodses (duration of their cycle of I renew) is "the index of spin of the supplyes".
This indicates the number of the times in which the suit happens renews of the stocks in a determined period of time.
Once calculated such index must interpret holding it account of the characteristics of the activity carried out from the company and of the assets that it deals.
The logical that a warehouse of an enterprise that perishable produced draft (es. yields) must have an index of spin higher than an other that features other category of goods (es. toys).
Is to easy comprise as an elevated index of spin is given to particular attention to this pointer since translate in minors understood is invested them in supplyes, minors costs financial, smaller operating costs of the warehouse.
To contrary, a low index of spin involves, beyond to those financial ones, other economic disadvantages represent from "risk factors" legacies to you to an eventual decrease of the market prices and to changes in the question (variation of the preferences of the consumers).
The calculation of the spin index can happen through two modality to second that takes in consideration physical amounts or values.
The method that uses physical amounts is calculated based on the relationship between the amounts sold or used in a data period of time and the amount of the recorded medium supply in the same period.
This formula allows to calculate the speed of renews of single goodses or single matters, or of groups of goodses or matters that can be expressed quantitatively with a common unit of measure, and is useful much in order to characterize which articles stretches to sostare too much to along in warehouse.
The medium supply can be calculated in 2 ways:
  1. (less precise method)
    The semisum of the existing amount to the beginning of the period () with that one in odd lot to the end of same (the Sf)
  2. (method with preciser approximation)
    This has dividend for 13 the sum of the existence begins them (S1) and of the 12 consistencies found to the end of every solar month (S1+S2+... +S13).
This method to the first one is preferred when an analysis of the lyings in warehouse is wanted to be made and to characterize which articles they stretch to sostare too much to along in warehouse.
In order to perceive the rhythm of I renew of warehouse to total level or with reference to groups of assets whose amount to you they are expressed with unit of different measure, it is necessary to calculate the relative index of spin to the generality of the assets deals you from the company or to the complex of the articles that form a data merceologico group.
To such aim it is opportune to render homogenous between they give to you expressing them in monetary terms, that is of value.
In such case we will have:  Obvious the company leaves from the objective to maintain or to improve the index to the inside of the average of field: this is obtained mainly playing on the spin rate.
If the spin rate is low they can have problems of low movementation of the warehouse that can affect the cash flow.
If the spin rate is much high it could generate high risk of goods lack to sell.


' philosophy' of famous management with the term Just-in-Time (JIT) the sight to obtain a managerial structure in which the enterprises purchasers are resupplied hardly of the materials of purchase ' in time' in order using them.
A case of "exasperated" application of JIT is that one of the Toyota, than it is resupplied from its suppliers to 15-30 intervals minuteren.
In enterprises like this, the objective ' zero supplyes ' is not at all an utopy, but one concrete realization. This objective does not have but to be pursued at all costs and in any case: to here of the obvious problems of practical realizability, such operating condition can, in fact, not to be convenient on the economic plan.
In defining the own political of supplying the enterprises are found in fact to face true and just an economic dilemma, where the cost reduction of consequent maintenance to the reduction of the level of the supplyes implies a purchase lottery much bottom, with consequent increase of the costs of order and transport.
Of other song, the mininare of the order costs and transport demand a refueling in only solution, with onerous consequences on the level of the invested them understood one in the supplyes.
In other words it is come to create a relative paradox to the management of the supplyes. This is given from the fact that in one oculata management of the supplyes must conciliate 2 contrasting requirements: from a part, to maintain to high their level, in order to guarantee the satisfaction of the business requirements (production, maintenance..) in presence of possibi accelerations of the consumptions.
From the other, to diminish their level in order to reduce lessened the costs to connected they. In practical, wrong political of management would end with unbalancing the result of the management business financial institution.

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